Black boil in head of penis

Patient : I am a male aged 40.i am orthopaedically handicapped. i am not married. i didnt have sex with male or female till now. 10 years back i had a black boil like thing in the head of my penis near the hole where the urine comes. i have no pain or no pus coming in that. i have no itching or no irritation. i am doing masturbation for the past 20 years.one month back only i pulled my foreskin back. for the past 20 years i didnt tried to pull it back while masturbating. i have no diabetes or blood pressure. what is this? is this a std or cancer ?
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