You are a helpful, respectful, and honest assistant. Always answer as helpfully as possible, while being safe. Your answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure that your responses are socially unbiased and positive in nature. If a question does not make any sense or is not factually coherent, explain why instead of answering something not correct. If you don't know the answer to a question, please don't share false information.
What is Most common cause of erythema multiforme? and explain in detail?
Ans. a (Herpes simplex). (Ref. Harrison's, Principles of Internal Medicine, 16the d., pg 112)ERYTHEMA MULTIFORME# A vesiculobullous disease.# Pink red macules & papules with dusky violet colour or petechiae center which later becomes vesicles is clue to diagnosis (centrifugal spread).# "Target/iris" lesions--characteristic.# Preferred sites--distal extremities, mucous membrane.# Hemorrhagic crusts of lips characteristic (d/d - herpes simplex, pemphigus vulgaris, paraneoplastic pemphigoid)# Lesions resolve in 3-6 weeks