A two-year-old female guinea-pig (Jen) we rescued back in January from a lady who could no longer look after them due to being wheelchair-bound, has two lumps under her chin - one either side of her throat. She has lost a lot of weight but is now slowly gaining it and is being treated for cystitis and diarrhoea. We have only just noticed the lumps, despite her being handled daily. Could they be anything serious? Other than being thin, she is her still fairly chirpy (but not her usual self).
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