M.H.
I would make him disinfect it with antibacterial or an alcohol swab. Explain to him how his body was made to take care of cuts on its own and the process it goes through is scabbing. If he can't let his body do what it's suppose to do then help him along. A picked scab hurts more than a covered scab. Put alcohol on it and then antibiotic cream, cover it for a day and then remove the bandage. If he picks on it, start all over. I'm a mother of six and I have several kids that went through this in the past. When they realize how much alcohol hurts they stop picking on it.