Asking for my bestie , is this an sti or std

my bestie sent me a pix of a bump on near his anus and he had a a couple months now i am trying to let him know he should find a doctor but first time so he is scared. can someone tell me is this a sti or std? he said it is hard sometimes, sometimes pus leak (this happens when hes take L lysine) and hurt sometime

image

sounds more like some kind of small cyst

if it keeps filling emptying and refilling will need to go to a doctors to have it removed usually they develop a little drainage hole in them

thank you