https://www.vetsurgeon.org/f/clinical-questions/9506/masses-in-guinea-pigs I was wondering if anyone could offer me some suggestions regarding this case. I saw 2 sibling 18m FE GPs recently presented with masses. One has a 1.5cm firm s/c (not adherent to skin), non painful mass L axillary area, unsure how long been presenten-USTelligent Community 10https://www.vetsurgeon.org/thread/46522?ContentTypeID=1Mon, 10 Oct 2011 14:08:40 GMT146601cc-3922-4be7-9974-7e1d4e45a66b:bf9e3cfb-2347-488d-b682-d39df52dfaffMark Rowland<p>I would biopsy one to be safe, full surgical biopsy. </p> <p>Most are lipomata, My own gp had loads of flattened discoid masses that were (I removed 1 and histoed it). Ive seen lots of GPs with the same (biopsy and histo confirmed) but would always recommend a biopsy. If there is loads of pus, go for a culture also.</p> <p>Goodluck</p><div style="clear:both;"></div>https://www.vetsurgeon.org/thread/46519?ContentTypeID=1Mon, 10 Oct 2011 13:38:40 GMT146601cc-3922-4be7-9974-7e1d4e45a66b:39c94431-fc8b-49f0-9716-d4e4d470d156Bob Russell<p>Are they fighting? Cautious FNA may be in order. Is&nbsp;there&nbsp;pus there? If not staining cells may give you a clue. The origins of the masses may be coincidence however.</p> <p>One for the exotics folk perhaps!</p><div style="clear:both;"></div>