Sore/lump on hedgehog?
 

I adopted a severely neglected Hedgie and have been trying to get him back to health. While giving him a bath, I noticed a red lump on his skin and saw that it had something sticking out of it and was bleeding! He had mites, so is it a product of the infestation? (A quill is also growing out of it)

It could be from mites or it could be a bacterial skin infection. Either way he needs to see a vet.