How old is he/she? I've yet to have a young one but he/she is probably starting quilling, which is where they drop out their baby quills for larger ones.
That's from the Disorder section of HHC. Mites are somewhat easy to treat, you get yourself some Revolution For Kittens either from your vet or you can find it for sale online, and give them a small drop on their back between the shoulder blades. You give them .01 ml (point zero one) with a syringe (without the needle) per 400g of weight.Mites are very commons, Symptoms include quill loss, scratching, dry flaky skin, and tattered ears. Mite infestations can lead to red inflamed skin, open sores, blindness, ear infections and death. See your vet for mite treatments. Wash and disinfect cages, wheels, etc. Remove any wood products (hidey logs, etc) from the hedgehogs cage, these products are nearly impossible to disinfect, and can harbor mites and their eggs. One method to help determine if there are mites present, place your hedgehog on a black cloth and gently rub its quills. Next place the cloth under a bright light and look for white dots that are moving about. If you see movement then your hedgehog has mites.