Small bump on penis Corona. Help

I have noticed about a month ago this bump on the head of my penis. The size varies especially after masturbation. It's not itchy, doesn't burn, leak, flake and not really noticeable while erect. I haven't had any sexual partners in the last 2 years. What can this be? Was it bad hygiene, rough masturbation, fungus? Thanks in advance

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might be an abcess or skin disorder, but if it worries you than you should go get it looked at & maybe have a biopsy or std test done.

Experiencing something similar currently, did you ever find out what it was or did it just disappear?