I get big ole lumps all in my glute; typically they take longer to go away if they are a long ester. I'm running prop & npp @ 200mg/ml and mast prop @ 125mg/ml and those pins are full when they go in... lump is usually gone in a few days tops. I have had some funny things happen so I keep some cow penicillin in the house... sounds crazy but I havent been to the hospital yet. One time I injected it and got a super big head rush, I did not like that shit!