Q: i have a guinea pig and right behind her left and right ears, she seems to have a patch of hair just like, missing. like if i move the fur apart she just has a chunk missing. it's about the size of a dime or penny. it's the size of a quarter behind her left ear. the skin is dry and she was not reacting when i touched it (it's not itchy or anything) and it's black. what could it be? i'm going to take her to the vet, but in the meantime, what might it possibly be from the symtoms i've listed?

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