Martin arrived with us last month. As the first new member to the household, he underwent a quarantine period, which I was thankful for when I noticed a small bald patch on his head.
As a precaution, I have been treating this patch as if it is ringworm, but the breeder suspected it was a scratch and she was probably right as it has not spread anywhere else and is healing well (also, ringworm is highly contagious but I’ve seen all her other guinea pigs and none of them exhibit this same problem).
Martin is now out of quarantine and able to make new friends!