L56.4

Clinical Causes: Exposure to sunlight, particularly UVB rays Hypersensitivity reaction of the skin to sunlight Genetic predisposition in some cases Certain medications that increase photosensitivity, such as antibiotics or diuretics Indoor or artificial UV light sources

Key Symptoms: Red or pink rash that develops within hours or days after sun exposure Itching or burning sensation on affected skin Small bumps, flat discolorations, or sometimes larger plaques The rash often appears on areas exposed to the sun, such as arms, neck, chest, and face May recur annually during sunnier months In some cases, the rash can persist for days to weeks if exposure continues

Diagnosis Path: Diagnosis typically involves a clinical evaluation by a healthcare provider, who will examine the skin and review your medical history, especially noting recent sun exposure. Sometimes, a photosensitivity test may be performed, exposing small patches of skin to UV light in a controlled environment to observe reactions. It is important to rule out other skin conditions with similar appearances, such as allergic reactions or other photodermatoses.

Treatment Protocols: Avoidance of sun exposure, especially during peak hours (10 a.m. to 4 p.m.) Wearing protective clothing such as long sleeves, hats, and sunglasses Applying broad-spectrum sunscreens with high SPF to exposed skin Using topical corticosteroids to reduce inflammation and itching Taking antihistamines to alleviate itching Gradual exposure to sunlight to build tolerance in some cases under medical supervision In persistent or severe cases, a healthcare provider may prescribe medications or recommend phototherapy or other interventions