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How to diagnose lumps in guinea pigs
Look for abscesses on the head and neck.
Abscesses under the skin are very common in guinea pigs. They are the body's attempt to' wall off' an infection and keep it from spreading.
Abscesses can form either after a bite from another guinea pig, or if something rough and sharp (e.g., straw) goes through the skin. They can form anywhere on a guinea pig's body, but the most common locations are the head and neck.