Hi sir, Before two years I had oral sex with my...

Hi sir, Before two years I had oral sex with my friend a boy, after that I found a white rash on my penis skin which is not painful but a little bit ichy, it last for 6 months without spreading and after that once I decided to consult a dermatologist so afrer examination of doctor he prescribed me one ear and eye drops (Tobacin eye/ear drops) to clean the infected area in my penis and after that he gives an ointment ( Ebernet-M). After putting those medicine the rash got healed and then after one month I found same rash on my penis head. So I continue the same medicine it disappears, now the same rash coming again and again. But while urinating there is no pain, there is no muscle ache or tiredness kind. Please can anyone tell me what kind of disease is that..is that any kind of std, I am so scared now. Thanks Ravi kiran