Hi there. It appears 3 dermatologist
have 'seen' you. It is very difficult for me to comment 'online' on such a long standing problem. It is imperative you take another 'visual opinion'. From what you describe & your history, i would advice some blood tests namely a serum test for chlamydia & for herpes
simples 1 & 2 virus' namely Igg
& igM. Do hope this helps give you a clearer picture. Good luck. If you reveal your location, will be happy to recommend a dermatologist nearest you to consult. Cheers!
Dr Praveen Rodrigues MD Dermatologist, COsmetologist, Venereologist, Vikram Hospital, Bangalore, India