It could because of something sharp in there habitat or fighting with with the other piggy/piggies, i would suggest if it is a minor wound to clean it with antiseptic but if its a bit more severe i would consult a vet x
Has your guinea pig been scratching. I am no expert but it does look quite sore. If I was you I would consult a vet asap. Because any skin conditions can get worse very quickly.
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