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 A 12 year old boy after spending his holiday in a Kovalam beach develops pruritic haemorrhagic vesicles on cheeks, ears, nose and hands after 12 hours. A week later the lesions crusted and healed with permanent scars. What is the most probable diagnosis? and explain in detail?
All these are acquired autoimmune photodermatoses of which hydroa vacciniforme presents typically in the 1st decade of life with haemmorhagic vesicles healing with scars. Ref: Rook's Textbook of Dermatology, 8th Edition, Page 29.15