I was giving my pigs a bath and nail trim when I saw a dark growth on there feet. I asked my parents what they taught it was and they had no idea. The pigs are eating normal and walking/jumping around normal. They have had them for around a month now. I would of gone to a vet but my parent's said if they are acting normal to just leave it. I just found this website and was hoping to find an answer to what it could be. the growth looks like poo but wont come off in water it is also hard