Sunlight Allergies: Can You Develop Them In Adulthood? 

Allergies are typically associated with childhood—but some develop much later in life. One surprising example? Sunlight allergies. Also known as photosensitivity, this condition causes your skin to develop an itchy rash or bumps after sun exposure. While anyone can experience it, sunlight allergies are more common in people with lighter skin tones or a family history of skin sensitivities.

Let’s explore the symptoms, risks, and treatments—and how BASS Medical Group can help.

What Is a Sunlight Allergy?

A sunlight allergy refers to immune system reactions triggered by UV exposure. It can result in hives, red patches, blistering, or scaling—often within minutes of being outdoors. The most common type is polymorphic light eruption (PMLE), sometimes called sun poisoning.

Other sunlight-related conditions include:

• Actinic prurigo (genetic, more severe PMLE)
• Solar urticaria (hives from sunlight)
• Photoallergic reactions (triggered by UV-exposed chemicals or medications)

Why Do Some People Develop It Later in Life?

Most adult-onset sun allergies are related to:

• Reduced immune function (due to illness, autoimmune conditions, or aging)
• New medications like antibiotics, pain relievers, or diuretics
• Topical chemicals (e.g., fragrances, sunscreens, or cosmetics)
• Delayed exposure to intense sunlight, such as after moving to a sunnier climate

Genetics also play a role. If a parent or sibling has a photosensitivity disorder, your chances increase.

Symptoms of a Sunlight Allergy

Symptoms can vary based on the severity and type but commonly include:

• Red, itchy rash
• Tiny bumps or raised patches
• Blistering or peeling
• Hives
• Burning or stinging sensation
• Scaly or crusted skin

These usually appear on areas not regularly exposed to sun, like the chest, shoulders, and arms.

When to See a Doctor

You should schedule an appointment with a dermatologist or primary care provider if:

• Your rash occurs consistently after sun exposure
• Symptoms worsen or don’t improve with sunscreen or avoidance
• You experience pain, bleeding, or scabbing
• There’s a personal or family history of autoimmune conditions

Proper diagnosis may include a photo patch test or blood work to rule out lupus or other conditions.

Prevention Tips for Sunlight Allergies

While there’s no cure for sunlight allergy, you can significantly reduce your flare-ups with the following strategies:

• Limit sun exposure, especially between 10 a.m. and 4 p.m.
• Gradually increase time outdoors to build UV tolerance
• Wear protective clothing: long sleeves, wide-brimmed hats, and UV-blocking sunglasses
• Apply broad-spectrum sunscreen with SPF 30 or higher, even on cloudy days
• Avoid photoactive foods like celery, wild parsnips, or limes before sun exposure
• Check your medications: Ask your doctor if any prescriptions increase photosensitivity

Treatment Options

For mild cases, over-the-counter antihistamines or corticosteroid creams can help manage itching and inflammation. More persistent cases may require prescription creams, phototherapy, or immune-suppressing medications.

The specialists at BASS Medical Group can evaluate your skin reactions, recommend lab testing, and customize a treatment plan tailored to your symptoms.

Don’t Let The Sun Hold You Back

Sunlight allergies can interfere with your lifestyle, but with expert care and the right preventative steps, flare-ups can be managed. At BASS Medical Group, our Primary Care Providers can help identify your triggers, recommend treatment options, and refer you to a specialist if needed. We serve patients across Walnut Creek, Oakland, San Francisco, and the greater Bay Area.

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