Bro, I am currently taking Sust and it leaves a little lump for a day or 2 but it goes away. You also have to remember that prop is a little painful when injecting and so is sust. You will probably notice a little more discomfort then usuall because because of the both already being somewhat painfull injections. Also do not forget that Sust has 30mg of prop in it so it is actually like taking 80mg of prop at once in addition to the 3 other test that are in Sust.