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What is Exposure to sunlight can precipitate and explain in detail?
Exposure to sunlight is a predisposing factor but only 4% of patients are affected, so chloasma is the better answer .Melasma (also known as chloasma faciei, or the mask of pregnancy when present in pregnant women) is a tan or dark skin discoloration. Melasma is thought to be caused by sun exposure, genetic predisposition, hormone changes, and skin irritation. DLE is a benign inflammatory disorder of the skin. Presents with well defined scaly patches which heal with atrophy, scarring, and pigmentary changes. Factors predisposing to DLE: 1.trauma 2.streas 3.UV exposure 4.infection 5.drugs 6.seaonal exacerbations 7.cold exposure Ref: Harrison 20th edition pg 1234