A retained shed every now and then on the tip of the tail isn't going to cause major problems. But, if it is an often occuring thing then there is a problem. How is the humidity for the rest of the time? It has to stay pretty constantly humid and then bumped up for sheds.
If he has been having problems he may need to do soaks when in shed to try to aleviate what is causing this. Has he carefully checked the snake for mites? The problem with incomplete tail sheddding is that it can eventually cause a rubberband effect around the tip of the tail causing loss of circulation and eventually amputation. Normally I would say just increase humidity and make sure it comes off with the next shed but I'm going to say that he has to be carefully sure his sheds are coming off since this has happened.
Either this is the case or the retained shed has caused the snake to injure his tail on something while trying to get it off. Rubbing it too hard on a rock, piece of wood or whatever he uses.
Have your friend make sure the sheds are complete. If they are not then he may have to help him with soaks, wet towel, etc. As far as the scab goes I would just clean it with 10% peroxide solution and he can use neosporin or bacitracin withOUT the pain reliever in it to get it to heel. It will eventually scar and probably shed fine.
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