I always cleaned my kids with rubbing alcohol it dries it out so when it fell off they just fell. But maybe the diaper is rubbing against it and irritating it? Um maybe try putting some polysporyn (sp?) on it?? And then just make sure to keep everything from touching it. Or even maybe just let the air get at it for a day and see what happens. Just thought I’d suggest some things hopefully it heals up quick if not I’d take him to the dr for them to see