can someone tell me what the bumps on jingis dick are..

Those are beads that can be surgically added in the ducks. I saw it in some other manhwa first hence the knowledge

Its a body modification alot of ppl do stuff like that that one mostly known is the bagel head some ppl do stuff on there hands and others get little horns im assuming he got copy of like dick bumps to increase pleasure in there partner-thats gotta hurt tho lol