I was using a very cheap source from a foreign country, the stuff had pip very bad .... I was still new to gear at the time didnt inject anywhere but my quads well long story short .... I thought the pip would be gone after a week but it wasnt.... injected there anyway n blood came flying out lmao .... Boy was I scared at the time but I'm still alive .... Since then, no more cheap stuff lol and i alternate sites ....