Dear Sir, I am Ravi kiran 29 years. 2 years back...

Dear Sir, I am Ravi kiran 29 years. 2 years back I had oral sex with my friend (male). After that I have seen a white sore in my penis fore skin it was painless and a bit ichy, so I didn't care of that after months it become big like 1 cm round area and it lasts for 6 months after that I decided to consult a dermatologist, so after checking he prescribed an ear drops (Tobacin ear/eye drops) to clean the infected area and an ointment (Ebernet-M) to apply. After two weeks of using these medicines the rash disappeared and a black mark remains there.again after 2 months same rash found on my penis head I have use the same ointment and it disappears now this is coming like again and again but no pain while urinating no pain on the sore but it is a bit ichy not like heavy ichy. I don't have any tiredness like symptoms also...I got scared now what is going on. Is this any kind of Std. Please help Thanks Ravi