I dont know what is this but it is there since 10-12 years, i noticed it first when i was 10 and now i am almost 23 and its still there. Size hasn't changed, no pain while touching, no irritation. Its same as it was when i first saw this thing . Is there anything to worry? Earlier i consulted with a dermatologist but the doctor only looked at images and said if it isnt paining or growing then there is nothing to worry. It is on the inner side of foreskin.