It looks like acne to me too. Hopefully Pixel's pooping problem isn't anything serious. Please keep us updated.

My Sunny also has acne on his chin. He gets little black specs. I now use only stainless steel bowls and I wash them out everyday and now run them in my dishwasher once a week too. He broke out with it again about a month ago and I've been cleaning it daily with peroxide but it keeps coming back. I asked the vet about it last year and he gave me some cream to use but it didn't seem to help. I'm just glad it's not anything serious.