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Sun Allergy: Causes, Symptoms & Treatment
Sun allergy describes a hypersensitive skin reaction to UV radiation. Typical symptoms include redness, itching, and a skin rash after sun exposure.
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Sun allergy describes a hypersensitive skin reaction to UV radiation. Typical symptoms include redness, itching, and a skin rash after sun exposure.
What is a Sun Allergy?
The term sun allergy refers to an oversensitive reaction of the skin to UV radiation. Medically, it is often not a true allergy in the classical sense, but rather a light-induced skin reaction in which the immune system responds to UV-altered skin structures. The most common form is known as polymorphous light eruption (PLE). It predominantly affects fair-skinned individuals, women, and people who are exposed to intense sunlight after a prolonged period without sun exposure.
Causes
The exact causes are not yet fully understood, but the following factors are considered to contribute:
- UV-A and UV-B radiation as primary triggers
- Genetic predisposition (familial clustering has been observed)
- Photoallergic reactions triggered by certain substances such as cosmetics, fragrances, or medications
- Phototoxic reactions caused by plant-derived compounds such as furanocoumarins (e.g., found in citrus fruits or certain plants)
- Systemic conditions such as lupus erythematosus, which can cause light sensitivity
Symptoms
Symptoms of a sun allergy typically appear minutes to hours after sun exposure and may include:
- Redness (erythema) of sun-exposed skin areas
- Intense itching (pruritus)
- Small papules, vesicles, or wheals
- Burning or tightening sensation of the skin
- In severe cases: swelling and widespread skin rashes
Symptoms typically subside within a few days if further sun exposure is avoided.
Diagnosis
A sun allergy is diagnosed by a dermatologist and typically involves:
- Medical history: Questions about symptoms, triggers, and medications
- Photoprovocation testing (phototesting): Controlled UV irradiation of the skin in increasing doses to measure the reaction
- Photopatch testing: Detection of photoallergic reactions to specific substances
- Blood tests: To rule out systemic conditions such as lupus erythematosus
Treatment
Acute Treatment
During an acute flare-up, the following measures are recommended:
- Cooling lotions or gels to relieve itching and burning
- Corticosteroid creams (topical cortisone) to reduce inflammation
- Antihistamines (oral or topical) to reduce itching and allergic response
- Sun protection and avoidance during the reaction phase
Prevention and Long-Term Measures
- Apply a high sun protection factor (SPF 50+) with both UV-A and UV-B protection
- Wear UV-protective clothing and a hat
- Gradual skin acclimatization to sunlight at the beginning of the sunny season (light hardening)
- Taking antioxidants (e.g., beta-carotene, vitamin C and E) may provide supportive benefits
- Phototherapy (UV desensitization) under medical supervision for severe cases
- Avoid triggering substances such as certain cosmetics, fragrances, or medications
When to See a Doctor?
Medical advice should be sought if:
- the skin reactions are severe or painful
- symptoms do not resolve despite avoiding sun exposure
- additional symptoms such as fever or mucous membrane reactions occur
- reactions also appear under normal indoor lighting (possible indication of a systemic condition)
References
- German Dermatological Society (DDG): Guideline on polymorphous light eruption. AWMF Registration No. 013-029 (2022).
- Lehmann P. et al. - Polymorphous light eruption. In: Journal of the German Society of Dermatology (JDDG), 2011; 9(6): 435-444.
- World Health Organization (WHO): Ultraviolet radiation and human health. Fact Sheet. Available at: https://www.who.int/news-room/fact-sheets/detail/ultraviolet-radiation (2023).
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