So I have a guinea pig which is 6 months and a few days old and I took him out today and didn’t notice anything unusual. But as I was stroking him earlier on I could feel a lump on his back not much bigger than a pea. I parted his hair to see a reddish black lump on his back. He seems to be acting normal but I am still concerned. Any ideas on what it is...
I recommend taking your piggy to the vet