Doubt very much its STD related Matey
tbh, and i am in trutful mode
(havnt started my new LPSG game yet)
I DID have similar on the actual skin of the penis,close to if not on the foreskin, from a young age, to maybe 20 odd, too embarrased to tell a Parent
It honestly just dissapeard at that age of 20 or so ..
(thankfully it did NOT multiply or it would have been a case of Fuck the embarrasment)
btw
realsie your that age now, so would not be surprised if a Dr just 'froze it off'
ONLY surmising Matey
Best to you ..