Diagnosis, Prevention, and Medication for Allergy Rash


Can seasonal allergies cause a rash?

Seasonal allergies can cause rashes, a product of the body's response to adverse environmental conditions, which can include exposure to allergens. While not everyone will experience rashes, those who are particularly sensitive may find that their skin develops an itchy or raised response to the presence of allergens.

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Skin is considered to be the largest human organ, making up roughly 16 percent of the body. It, like other systems, plays an interconnected role in our overall health. When skin reacts to something, it is often the body’s way of communicating that something is wrong. One common skin reaction is a rash; an outbreak of patches or lesions on the skin. Allergies are a major cause of rashes, and they can be triggered by numerous environmental factors. In this article, we discuss the causes, symptoms, and differences of an allergy rash.

Can Allergies Cause A Rash?

As the first line of defense against harmful agents, skin is constantly exposed to allergens that can cause a rash. Seasonal allergies are particularly common triggers for skin rashes, which can vary in severity depending on the individual.

While rashes may be a result of an allergic reaction to inhaled or ingested allergens, such as pollen or pet dander, in some cases, rashes occur as the result of direct contact with substances like a prickly plant or cleaning chemical.

What Is An Allergic Reaction Rash?

When an allergen is introduced to the body, the immune system reacts by producing antibodies and other chemicals that cause inflammation. This response can manifest as different types of skin rashes depending on the individual but typically presents as redness, hives, or itchy bumps.

Generally speaking, the most common type of rash experienced by allergy sufferers is contact dermatitis, which is the result of direct contact with an allergen. It's considered a type of eczema and causes the skin to become itchy, dry, blistered, and cracked. While this type of rash can be uncomfortable, it is usually not dangerous.

Other types of rashes that can be caused by allergies include urticaria (hives), atopic dermatitis, and angioedema.

It's important to note that lesion types don't necessarily indicate the seriousness of an allergy - individuals can react differently to different allergens. Rash growth and spread, however, can be used as a gauge of severity and is sometimes used to diagnose allergies.

What Allergies Cause Rashes?

Rashes can occur in response to many allergens but are most common for those that involve topical exposure. Airborne irritants, like pollen, pet dander, and dust mites can also cause allergic reactions in the skin as part of the body's greater immune response.

As the initial point of physical contact, the skin is especially sensitive to allergens and can respond quickly to even the slightest stimulus. The following is a list of some of the most common allergens known to cause rashes along with the places they can be found.

Dog and Cat Dander

Dander is a microscopic particle of skin or fur, and can be spread through the air, clothing, and furniture. It's often airborne and can trigger a variety of allergic reactions in the body, including itchy rashes. You'll usually find this allergen in homes with dogs, cats, or other haired animals, although it can accumulate in other spaces as well.


Pollen is a fine, powdery substance emitted from plants as part of their natural reproductive cycle. It is largely airborne, however upon traveling through wind flows, can easily stick to fabric, surfaces, and skin. Pollen allergies can cause sneezing and itchy eyes, but in some cases can lead to a rash as well.

Mold and Fungi

Molds and fungi are naturally occurring microorganisms that grow on surfaces, such as walls and furniture. They spread by emitting airborne spores that can cause allergy-like reactions, including rashes. They're most commonly found in damp areas like bathrooms and basements, but can also be present in other parts of the home.

Dust Mites

Dust mites are tiny organisms that feed off of dead skin cells and live in bedding, furniture, and other soft materials. Being microscopic, they can be difficult to spot but can cause allergic reactions such as sneezing and itchy skin.

Poison Ivy and Oak

Touching plants like poison ivy and oak can cause an itchy, red rash as well as swelling and blistering. These plants contain a chemical compound called urushiol, which triggers a reaction when it comes in contact with human skin. Roughly 85% of the population is sensitive to this compound, so it's important to avoid contact whenever possible.

Chemicals and Cosmetics

Chemicals and cosmetics can contain a variety of allergens that can cause rashes. While most modern products are tested for safety, some people may still experience a reaction due to individual sensitivities. Certain perfumes and detergents may trigger an allergic response, as can latex and other rubber materials.

Symptoms of An Allergy Rash

The experience you have with an allergy-induced rash will depend entirely on your specific sensitivities, your immune system, and exposure. Rashes present themselves in several different ways, and in most cases, no two will look the same.

In general, however, you can expect an allergy rash to cause symptoms along the lines of redness, itching, and swelling. In some cases, the skin may become dry, cracked, or begin to swell.

It's important to understand that the extensity of rash symptoms can be quite broad. In some cases, you may only experience a few spots or small bumps, while in other instances an entire area of skin may be affected. What this will come down to is your individual allergy and the severity of the reaction at hand. Pain and spread can be worsened by scratching, picking at, or rubbing the irritated area.

What Is The Difference Between A Rash and Hives?

While they often share common characteristics, not all skin lesions fall under the same definition of a 'rash'. Other conditions, like hives and eczema, are each their own entities and shouldn’t be conflated with an allergy rash. While they may co-occur, it’s important to note they're not interchangeable.

Hives, also known as urticaria, are raised red welts that appear on the surface of the skin. They can range in size and shape and can be accompanied by itching or burning sensations. Hives are commonly caused by allergic reactions, however, they can be triggered by many other things.

Eczema is another skin condition that can be caused by allergies and is especially common in young children. It presents itself as an inflamed, red rash that can cause itching, flaky skin, and blistering. Eczema is usually found on the face, hands, feet, insides of elbows, and behind the knees.

It's always best to consult with your doctor if you're experiencing an allergy rash, as they will be able to provide the best diagnosis and treatment options.

What Does An Allergy Rash Look Like?

An allergy rash can vary in appearance depending on the cause, so no two rashes will be exactly alike. However, its most common characteristics are redness, itching, and swelling. In some cases, the skin may become dry, cracked, or begin to swell.

It can also appear as small spots or bumps that are itchy and inflamed, or larger raised patches that are red and inflamed. In severe cases, an allergy rash may spread to other areas of the body and become painful or itchy.

What Else Causes Rashes?

Allergies are not the only potential cause of a rash. Other irritants, conditions, and illnesses can also cause skin inflammation. It’s important to know about these other causes so that you can get the right treatment. The following is a list of some of the other possible sources:

Bacterial and Viral Infections

Bacterial and viral infections, such as staphylococcal, streptococcal, and chicken pox, can cause rashes. These infections are contagious and can spread through contact with other people or objects. They often present as a red rash along with other symptoms, such as fever and sore throat.


Stress can cause a variety of physical symptoms, including rashes. This type of rash is often referred to as “stress rash” and typically appears on the arms, chest, and neck. Stress rash may be accompanied by other symptoms, such as fatigue and difficulty sleeping.


Exposure to the sun can cause a variety of skin reactions, including itching and redness. Sunburn is especially common during the summer months when ultraviolet (UV) radiation levels are at their highest. To prevent sunburn, it's important to wear sunscreen outdoors.

Insect Bites

Insects like mosquitoes, fleas, and ticks can bite, leaving behind an itchy rash. In some cases, this rash may be a sign of a more serious condition, such as Lyme disease. It's important to see a doctor if the rash is accompanied by other symptoms like fever or muscle aches.

Heat Rash

Heat rash, also known as prickly heat or miliaria, is a result of blocked sweat ducts. It is most common in hot, humid environments and can often be prevented by wearing breathable fabrics or staying cool. The rash itself appears as tiny red bumps that may feel prickly or itchy.


Eczema is a chronic skin condition that presents as dry, scaly, and itchy patches on the body. In some cases, it can also be accompanied by a rash. This condition is most often caused by genetics, although stress and environmental factors can also contribute.


Psoriasis is a skin condition that causes red and scaly patches, most often on the elbows, knees, and scalp. It's not contagious but can cause discomfort and itching. In some cases, a rash may form around the patches. This condition is believed to be caused by genetics or an immune system disorder.

Autoimmune Disorders

Autoimmune disorders, such as lupus and rheumatoid arthritis, can cause a rash to form on the skin. These rashes are typically red and scaly, but may also be accompanied by other symptoms such as fever and joint pain. Treatment for autoimmune disorders varies depending on the underlying cause.

Drug Reactions

Certain medications can trigger an allergic reaction that results in a rash. This is known as an adverse drug reaction and can be caused by both prescription and over-the-counter (OTC) medications. It's important to speak with a doctor if you experience any unexpected reactions when taking a new medication.

Hormonal Changes

Hormonal changes can affect the skin, such as during puberty or pregnancy. This can cause various bumps and rashes, often on the face, neck, and chest. Hormonal rashes usually clear up on their own but can be treated with topical creams or medications.

How to Get Rid of A Rash

Regardless of how it occurs, a rash can be an uncomfortable and unsightly problem to have. Luckily, there are many treatment options out there - both home and OTC - that can be effective in reducing symptom severity.

Home Remedies

Home remedies can be your first line of treatment options against a rash. They're accessible, usually inexpensive, and can be effective in providing relief from itching and inflammation.

Options include:

Epsom Salts

Epsom salts are a valuable tool when it comes to reducing inflammation and relieving itching. Soaking in a warm bath with 1-2 cups of Epsom salts can help to soothe the discomfort associated with many types of rashes.

Baking Soda

Baking soda is a great home remedy for relieving itching and inflammation. It can be used as a paste or in a bath by mixing 1 cup of baking soda with 1 cup of water.

Essential Oils

Essential oils like tea tree, lavender, and chamomile can help to ease itching and skin irritation. They should be diluted in a carrier oil such as coconut or almond, then applied topically to the affected area.

Aloe Vera

The gel from an aloe vera plant can be applied directly to the skin to help reduce inflammation and itching. Aloe vera is also known for its moisturizing properties, making it ideal for treating the dryness and scaling associated with a rash.

Using Cold Compresses

Applying a cold, damp cloth or compress to the affected area can help reduce inflammation and relieve itching.

Taking a Cool Bath

Soaking in a cool bath can help reduce the discomfort of the rash. A few tablespoons of oatmeal, baking soda, or colloidal oatmeal can also be added to the water to reduce inflammation and itching.

Applying Soothing Lotions or Creams

Creams such as calamine lotion or hydrocortisone cream can help reduce itching and inflammation. These should only be used as directed on the label.


Some rashes may require medication to reduce inflammation, itching, and discomfort. The following are some examples of medications that can be used to treat rashes:


Antihistamines like Benadryl (diphenhydramine) can be taken orally to temporarily reduce itching and inflammation. They work by blocking the release of histamines, which are responsible for causing allergic reactions.


Corticosteroids like prednisone can be taken orally or applied topically to reduce inflammation and itching. It's important to use these cautiously, as they can cause side effects.

Antifungal Creams or Ointments

If the rash is caused by a fungal infection, an antifungal cream or ointment may be necessary. These can be applied directly to the affected area and may provide relief from itching and discomfort.

When to See a Doctor

In some cases, rashes may require medical attention. It's important to see a doctor if the rash is accompanied by other symptoms such as fever, difficulty breathing, or if it does not improve with home remedies. Additionally, a doctor should be consulted if the rash covers large areas of the body, is painful, or if it recurs frequently. A doctor can help diagnose the cause of the rash and provide appropriate treatment options.

How to Diagnose Allergies

If you are experiencing allergy symptoms, it is important to get tested and diagnosed by a professional. Knowing what your triggers are will help you find more effective treatment plans and long-term relief from your symptoms. There are two primary methods of allergy testing available.

Skin Prick Test

Skin prick testing is conducted in a doctor's office and is the most common way to test for allergies. During the test, a small amount of an allergen is pricked into your skin to observe and track any allergic reaction. If you are allergic to any tested substances, you will likely develop bumps or hives at the injection site.

At-Home Allergy Test

If you're looking for a less painful, more convenient alternative to prick testing, an at-home kit may be your best option. Here's how it works:

  1. Get Wyndly’s at-home allergy test. We ship our CLIA-certified test straight to your door.
  2. Take the allergy test and send it back to us. Just do a quick finger prick test to provide us with a blood sample and mail it back when you’re done.
  3. Receive your personal allergy profile. Our doctor will interpret your results, create an allergy profile, and walk you through a treatment plan.

Wyndly's at-home testing can offer insight into the full breadth of your allergies. Results will detail exactly what substances you're reactive to and the steps you can take to mitigate the symptoms.

How to Treat Seasonal Allergies

If you find yourself struggling with allergies and the symptoms that come along with them, there are a few things you can do to get some relief.

Limit Exposure

Limiting exposure to your allergy triggers is one of the most effective ways to prevent allergy symptoms. While some allergens are difficult to completely avoid, there are ways to reduce your exposure.

  • Check pollen counts: Pollen is the most common allergy trigger. Unfortunately, there's no way to avoid it completely. However, you can keep an eye on pollen levels in your area and try to limit your time outdoors on high-pollen days.
  • Watch your outdoor hours: Pollen levels fluctuate throughout the day and are often highest in the early morning and afternoon. If you're planning on going outside during the day, doing so during the evening is safest.
  • Keep windows closed: Pollen is airborne and can easily enter your home through an open window. Be sure to keep your windows shut and opt for A/C, especially during high-pollen count days.
  • Take shoes off: When you come in from outside, take your shoes off at the door to avoid tracking pollen and other allergens inside.
  • Wipe-off pets: If you have pets that spend time outdoors, wipe them down with a damp cloth when they come inside to remove any pollen they may be carrying.
  • Clean your home: Pollen can also come into your home on clothing, hair, and skin, so it's important to keep any surfaces you touch or interact with clean. Use a HEPA filter-equipped vacuum regularly and dust with a damp cloth.
  • Do laundry more often: Wash bedding, towels, and clothing frequently to remove any pollen that may have accumulated.

OTC Medications

If limiting your exposure to allergens isn't enough, there are a variety of OTC medications that can help with short-term symptom relief.

  • Antihistamines: Antihistamines work by temporarily blocking histamine, a chemical that your body releases in response to an allergic trigger. This relieves symptoms like itchiness, sneezing, and a runny nose.
  • Eye drops: If you tend to experience red, watery, or itchy eyes with allergies, then eye drops can provide you with short-term relief from these symptoms.
  • Nasal sprays: Nasal sprays clear pollen and other allergens from your nasal passages and reduce inflammation. This relieves symptoms like congestion.

Sublingual Immunotherapy

Sublingual immunotherapy is an allergy treatment that gradually exposes your body to your allergy triggers. Over time, sublingual immunotherapy allows your immune system to become desensitized to the allergen, which reduces your symptoms.

Sublingual immunotherapy is administered in the form of allergy drops or tablets that are placed under the tongue. These can be self-administered in the comfort of your home, making them a convenient and effective option for treating your allergies.

Take Our Allergy Assessment

To learn whether you may have allergies that are triggering your allergy rash, look no further than Wyndly! Wyndly’s allergy doctors will work with you to identify what’s triggering your allergy symptoms and help you find long-term relief.

Take our easy online assessment now to get started on your journey!

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