hello, i noticed a few days ago when i get an erection (and only when i get hard this is noticable)just to the left side of the opening to my penis it seem to swell up. looking like the opening is lopsided! im not sure what this is but i was masturbating and noticed it again, i was pushing down on it and it feels really hard, but goes away completly when im soft, now it seem to hurt when im just relaxing, my girlfriend has an (IUD) and has one for years. this has never happend before! but i did notice a small lump under my testes, but not in the sack out side of the sack i squezzed it and pus came out,it has never came back since! im not sure what this is. I dont have any medical insurence and i know u cant say what these problems are with out seeing it but please any info could help.