I bought a human hair wig on ebay last week. It is beautiful, but it smelled, so I washed it with tea tree shampoo, and it worked. Well, at least the smell is gone...But now, there is this bump on top of the wig, maybe more of a knot, that sticks up where the top layer of hair is. Ive tried brushing and combing to try and iron out the bump, but no luck. Any suggestions?