Hi, a detailed history needs to be undertaken. Is there severe burning and tingling, have u applied anything topically after which it has occurred, history of recent intimate contact (protected or unprotected), was there a preceeding fever, has it occurred for the first time, is there severe pain , are the blisters containing only clear fluid or also pus, etc. Hence u ought to consult a dermatologist for the detailed evaluation and management. Regards, Dr. Zubin Mandlewala MUMBAI