What Causes Solar Dermatitis?

Some people spend excessive time outdoors during summer, leading to skin redness and even peeling, itching, blistering, erythema, and edema—symptoms characteristic of solar dermatitis. Many individuals know little about this condition. So, what causes solar dermatitis?

What Causes Solar Dermatitis?

Solar dermatitis results from sun exposure, consumption of photosensitizing foods, or eating seafood. Ultraviolet (UV) radiation from sunlight inflicts significant damage on the skin. Prolonged outdoor exposure—especially direct sunlight on unprotected skin—can trigger symptoms such as erythema, pruritus, and rash. These symptoms worsen markedly upon sun exposure, constituting the primary cause of solar dermatitis. Certain foods—including Chinese cabbage, spinach, lettuce, cilantro, celery, lemon, tangerine, sweet orange, and figs—heighten cutaneous sensitivity to UV radiation when consumed before outdoor activities. In such cases, individuals may develop solar dermatitis; in severe instances, prolonged or repeated exposure may even increase cancer risk.

If you consume seafood during summer, avoid outdoor sun exposure afterward, as this may also provoke solar dermatitis. Common photosensitizing seafood include mud snails, crabs, and lobsters. Additionally, certain skincare products and cosmetics contain photosensitizing agents; improper use—followed by outdoor activity—may induce cutaneous allergic reactions and solar dermatitis. Similarly, medications such as antibiotics, antihypertensives, nonsteroidal anti-inflammatory drugs (NSAIDs), and cholesterol-lowering agents can heighten skin photosensitivity and precipitate solar dermatitis upon sun exposure.

Patients are advised to follow a light, bland diet—such as cabbage, potatoes, radishes, and Chinese yam—and may safely consume fruits like apples and pears. We hope this information proves helpful.