One of our boys, Carlo (who turns 3 next month) , was diagnosed with osteoarthritis in his two back legs April 2021 and has since been on loxicom for dogs twice daily since to help with his pain. Tonight I felt a small finger tip size bump under his front left leg which feels as if it moves under the skin but appears to be causing him discomfort if we touch it as he squirming a lot. I’m unsure of long term effects of medication on guinea pigs and wondered if the two were related or if this is a completely separate issue we’re looking at? Any advice is welcomed, all we seem to do is worry about him!