HOW TO TREAT MANGE~
1) Take him to the vet, and they should give the hedgehog an ivamec injection to kill the parasite. These are a course of injections; one every 2 weeks.
2) Once you have brought the little man home; hold him a pair of rubber gloves (washing up gloves) and hold him over a thick layer of newspaper or a plastic bag.
3) Steadily pour, a little bit at a time, some vegetable cooking oil (just plain so not to irritate the skin) whilst being careful not to get the oil into his ears, eyes or nose. Cover his whole body. In the tricky areas around the face, it is easiest to use a small paint brush. Ensure that he is thickly covered. The oil is to lift the chunks of mange up, and if there is loose prickles, pull them gently off. If they don't come freely; leave them.
4) Repeat the oiling every few days. The aim of this is to remove all the damaged skin and prickles, so yes they are bald for a little while.
5) Once the skin seems to be clear, so the skin is smooth and soft, there is no longer need to oil and so all he will need is the rest of the course of injections.
6) Keep the hedgehog in captivity until most of his prickles have grown back, otherwise he won't be able to defend himself.