SWIM missed two injections today. One into his left hand and one into his left joint. The injection spots are semi puffy, not discolored. I told him tosoak them in warm water. The heroin I get it's quite pure and he uses a new syringe for each injection. Should SWIM worry about getting an abscess? What are the chances? What should he look for? He is sort of worried because the injection sites are somewhat sore but not extremely painfully or anything. Currently nothing is visibly wrong but they are just tender. A small welt also appeared on swims wrist not even near the injection sight but it is now gone. Please any advice?