What does carp pox look like?

Carp pox, caused by a herpesvirus, manifests as raised, white to grayish lesions on the skin and fins of infected koi and carp. These lesions can vary in size and may appear as small, wart-like growths or larger, puffy areas, especially during cooler water temperatures. While carp pox is not usually fatal, it can lead to secondary infections and stress in the fish. The condition often resolves as water temperatures rise.