I wrote you but don´t know if you got it. The duplicate post you put up was empty (no text -- don´t know how this can happen) and this one didn´t describe your problem.
I had moved both of the posts to the maintenance forum to be deleted later and hoped you would try to post again. Since you haven´t posted, I´m sticking this back in hopes you will be able to describe your problem on this thread.
Sorry it has been difficult to get your question posted.
Earlier today I noticed that Muffin, a male, neutered, almost 2 years old, house guinea pig, has a lump. It’s on his abdomen, just proximal to the left nipple. The lump is about 3x3 cm, and soft. I half wondered if it was an abscess, but it’s not hot or particularly red and does not seem to be tender to touch. If it were on a human, I would wonder if it were a lipoma. He is eating well and acting normally. I’ll ring the vets in the morning, but would be glad of any of your ideas. Thanks,
I tracked down the picture of the lumpy pig and a description of some lumps in another that turned out to be sebaceous cysts (I think). Check out this thread: