I am a 15 year old boy, and in the last few weeks have discovered a small lump on the inside of my penis. It I located on the left side just above the middle. It is very noticeable when my penis is erect however, it is very hard to locate when not erect. It seems quite hard when erect, but I feel no pain or real discomfort. I am feeling pretty worried about this, and would be grateful for some help.

No offense but have you been masturbating? If you do It could be the effect of continuous, vigorous, or tight masturbation.

Could also be a simple insect or cockroach bite.

:) Don't know anything else

My names andrea and I'm 15 also I'm no doctor but I think it is best for you to see with a doctor or see with your parents cause you never know what that might be and if you don't say anything now then it could posible affect you... but like I sayed I am no doctor... good luck!

Go to this link. For some reason many of us are getting this lump. It goes away though in like a week or 2.

https://www.askmehelpdesk.com/child-teen-health/lump-penis-9243.html?highlight=lump+on+penis

It happens. And don't be too alarmed. It's most likely to be a blood clog in your penis. Could be from too much, tight masturbation or in the use of any medication to induce an erection. Your options are, to see a doctor, wait it out or when your penis is fully erected and you feel the lump. Gently massage the area. It will eventually feel as if the lump was never there.