Hello. I am 14 years old and I masturbate 1, sometimes 2 times almost everyday. A few months ago I noticed a brownish spot on the tip of my penis. I didn't think much of it because I had something like that before, and it went away in like a month or two. But this new spot is about 6 months "old" Its completly flat, with mostly consistent size(except during erection), somewhere between black and brown, but mostly brown. It doesn't hurt. I can add pictures in the comments if needed.
Should I be worried? Should I treat it somehow, or wait? I don't want to go to a doctor unless the spot is really dangerous.
Thank you.