So my guinea pig, Lily, is about 2.5 years old. She has tufty hair and in two spots on her back, there is little pieces of skin showing where her tufts go in different directions. Today I noticed that she has a little scab in each of those spots, and she seems to have quite a bit of dandruff on her when I pet her. It might be fine, but there also might be something wrong with her and I'm not sure. She's acting normal, not itching at all.