Please choose the correct ending to complete the given sentence: Pets and Animals: [header] How to diagnose lumps in guinea pigs [title] Look for abscesses on the head and neck. [step] 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.

Ending1: In some cases, these abscesses on the head or neck can lead to abscesses of the eyes, nose, and mouth. The abscess also appears between the nose and throat as a sign of low immune function and when the animal takes medication it may also appear under oral or bite status. Ending2: 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. Ending3: They are actually cancerous cancerous, which means the area below the skin is sensitive to uvb radiation. Abscesses are typically not visible on the face and neck. Ending4: [substeps] Guinea pigs with abscesses are most commonly found under noses over the head. A paralyzed guinea pig is able to go into a litter box, while another guinea pig is unable to go into the toilet.

Answer format: ending1/ending2/ending3/ending4