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You step outside on a sunny day, spend some time outdoors and everything seems fine. Then, a few hours later, your skin starts itching. You notice red patches, tiny bumps or even a few blisters.

If this sounds familiar, you may wonder, “Is it just sunburn?” Not necessarily. Sometimes, the skin can react to sunlight in a different way. This is commonly referred to as sun allergy. It is actually a group of skin reactions linked to sensitivity to ultraviolet (UV) rays. Depending on the type, symptoms may develop within minutes or within a few hours of exposure to the sun.

What Exactly Is Sun Allergy?

Sun allergy is not one specific skin condition. It’s a general term used for a number of reactions that occurs after exposure to sunlight. Sometimes the immune system sees sunlight as if it’s dangerous. The result can be redness, itching, rashes, small bumps or other changes on areas exposed to the sun. The most commonly affected areas are the face, neck, arms and hands. The reaction may be mild and go away in a few days but if you are exposed over and over again it could come back or can become more problematic.

What are the Symptoms of Sun Allergy?

Symptoms of sun allergy can differ from one person to person. You might see: 

• Red, irritated skin
• Itchiness
• Patchy skin rashes
• Small blisters or bumps
• Raised itchy bumps or welts
• Burning or stinging
• Flaky or dry skin
• Mild swelling

Some reactions occur within minutes of sun exposure but others can take hours to develop.

There Are Different Types of Sun Allergy

Not every sun-related rash is the same and its symptoms, how soon they appear and how long they last can vary depending on the type of reaction. 

Polymorphous light eruption (PMLE):

It is the most common type. It can cause itchy red bumps, welts or tiny blisters, often on the arms, neck and chest. A few hours after sun exposure it may appear.

Photoallergic reaction:

It can occur when sunlight interacts with certain substances, including some perfumes, sunscreens or medicines. The rash can take a day or two to develop and sometimes it can spread beyond the areas exposed to the sun.

Actinic prurigo:

This is a longer-lasting type that can cause intense itching, bumps and thickened patches. It often starts during childhood or adolescence and may affect both exposed and, sometimes, non-exposed areas.

Solar urticaria:

It is a rarer reaction that can happen within minutes, causing itchy hives or raised welts.

Sun Allergy or Sunburn?

It is easy get confused between the two. And looking at the rash yourself cannot always tell you exactly what is causing it. If you are unsure, a dermatologist can assess it properly. A sunburn happens because the skin has been damaged by too much UV exposure. It usually causes redness, tenderness, pain and burning, and the skin may peel later.

With sun allergy, itching and irritation are often more noticeable. The skin may develop patchy rashes, bumps or hives rather than an even area of redness. The reaction may also appear within minutes or a few hours after exposure.

What Can You Do If You Get a Sun Allergy Rash?

If the symptoms are mild, a few simple steps may make the skin more comfortable. Put a cool, moist cloth over the affected area for a few minutes. Soothing lotions with aloe vera or calamine can also help with irritation. It is helpful to moisturize the skin, especially if it is dry or itchy. A gentle, fragrance-free moisturiser can help support the skin while it settles. Avoid hot showers - heat can make dryness and irritation worse. It may be tempting to scratch but you should not as it can make the rash worse and also can lead to marks or infection. Loose, soft and breathable clothing can also help to ease the friction on irritated skin.

When Should You See a Dermatologist?

A mild reaction may settle on its own, but don't keep ignoring it if it is becoming a regular problem. Consider seeing a dermatologist if:

• The rash does not improve within a few days
• It keeps returning after sun exposure
• The itching is severe or affects your sleep
• The rash spreads over a large area
• You develop significant swelling or painful blisters
• The skin becomes warm, increasingly red or develops pus
• Repeated flare-ups are making it difficult to spend time outdoors

Treatment depends on the type and severity of the reaction. Depending on the situation, a dermatologist may recommend soothing topical treatments, short-term prescribed steroid creams, antihistamines or in people with repeated episodes, medically supervised phototherapy may be recommended.

Why Book an Appointment with Dr. Megha Modi at Twachaa ?

A recurring rash deserves more than trial-and-error with creams or home remedies. At Twachaa we assess skin conditions through a personalized consultation, examination and where necessary diagnostic testing to establish the underlying cause before planning treatment.

Dr. Megha Modi has lots of experience in dermatology and she specializes in skin allergies, urticaria, eczema and other skin problems. Twachaa also provides care for allergic reactions and recurring rashes as part of its clinical dermatology services.

Learn with us to keep your skin comfortable and enjoy the sunshine without worrying about the rashes.