Corinna: Thank you for your input, but it wasn't neccessary to do a search as Kim posted some good links.

Kitten645: No we don't use plastic bowls, never have. Their food is in a ceramic bowl and the water is in a stainless steel one. Thank you very much for your best wishes.

Kim: Thank you so much for those sites. They were a great help. It definitely looks like Baby Chipper has acne.

Rosethecopycat: Thank you very much for your response. I will try the hydrogen peroxide today.