I dont know how to describe this but I will try, yesterday my penis was irritated & burn a little I felt a lot better today morning but(excuse me but I have to say it)today I masturbate then my penis start burning alot when my penis retured to its normal form I realised a swelling in the middle of my penis and near the head its like a ring around my penis where the skin is thicker as if there is blood in those areas but no erection. Am young and I didnt have sex before and I use a drug called isotretinoin its for acne and ccause the skin to dry alot along with other side effects. can someone tell me whats happening ?