Sun allergy

 Overview

Sun allergy is a broad term. It describes several conditions that cause an itchy rash to form on the skin after being in sunlight or other sources of ultraviolet (UV) radiation. Polymorphous light eruption is the most common form of sun allergy.

Some people have a hereditary type of sun allergy. Others develop symptoms only when triggered by another factor — such as taking medication or touching certain plants. Other types of sun-related reactions occur for reasons that are unclear.

Mild sun allergy may clear up without treatment. Severe rashes may be treated with steroid creams or pills. If you have severe sun allergy, you may need to take preventive steps. For example, wear clothing that shields you from the sun.

Symptoms

How skin with sun allergy looks varies widely depending on the color of your skin and what's causing the symptoms. Signs and symptoms may include:

Itchiness (pruritus)
Stinging
Tiny bumps that may merge into raised patches
A flushing of the exposed area
Blisters or hives

Symptoms usually occur only on skin that has been exposed to the sun or other source of UV light. Symptoms show up within minutes to hours after sun exposure.

When to see a doctor

See a health care provider if you have unusual, bothersome skin reactions after being in the sun. For severe or persistent symptoms, you may need to see someone who specializes in diagnosing and treating skin disorders (dermatologist).

Causes

Causes of sun allergy include immune system reactions to sunlight, certain medications and chemicals that make the skin more sensitive to the sun. It isn't clear why some people have a sun allergy and others don't. Inherited traits may play a role.


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