Iv had my guinea pig for about 4 years now and i have noticed nothing wrong with her until now. I recently did a little health check up like I do and found a clump spot of hair and dandruff. I tried pulling some out and clean it up pretty good but i didnt go any further because the fur tended to go down into her and it looked red underneath. I didnt want to make her bleed or anything and was trying to look up solutions about it and find something but i found nothing on this. I clean her cage often, get her out often, she has a fairly roomy cage and i dont let her outside. Her eating habits are normal as well as everything else. I dont have the money for the vet and am terribly worried about her knowing i cant do anything for her. So can anyone tell me what this might be and how i could fix it? I will post the picture below.