I recently adopted 2 guinea pigs and one of them has developed a missing patch of fur. I've done some research online and I'm not sure if it's mites or her cagemate. The only 'treatment' I've given her is putting coconut oil on top of the bald spot to moisturize her skin, which 20 minutes after application reduced some of the dryness but left the spot still pretty dry (I read about some owners using coconut oil on their pigs bald/dry skin and it was the best option I had. My main concern is the possibility of having to see a vet since I'm a high schooler working at a fast food place earning minimum wage. Please I need someone who can tell me if this is some sort of infestation or what. I get paid tomorrow (April 2nd) so if need be I can take her up then, but I don't want to waste my paycheck if the vets can't do anything (seriously I had a mouse once that developed a tumor and I had to fork over 100 bucks just to be told that she would die in a few months) Thank you!!!