I'm a teen, 16 currently, and I am not sexually active.. At best, masturbation is the most active I've been.. A couple of days ago, I'd say specifically 3 days ago, a lump began to grow on the side of my penis, near the area where it meets with the testicles.. Today, after returning from the beach, I checked on it and the lump has turned into a small hole, with a black thing on the inside and some white puss-like stuff inside.. Nothing has come out of it though, besides a tiny amount of blood.. I have read elsewhere that this could simply be a result of masturbating too much, which as embarrassing it is too admit, is true.. But I have seen that another person on this website had the same problem as me.. I know the possibilities of what it could be: too much masturbation, STD(somehow?), or honestly I don't know what.. I'm very worried, seeing that it has developed so quickly, rather than taking a long period of time.. Could it need actual medical attention? Or should I just stop touching it and my penis, obviously the immediate course of action I'm taking.. Thank you for your attention and help.