"Coffee Grinds" on my cat's chin

[jennielynn1970]

Oh, I don't think the aquarium water is good for them. There can be all sorts of icky things in the water in there. Always make sure you don't put your hand in the aquarium if you have a cut on your hand anywhere unless you use a latex glove to keep the water out of the cut. There are all kinds of micro-organisms in aquarium water.

[Kater]

As others have said, it appears to be kitty acne. A steamy washcloth is a good first line of defense. If that is not clearing it up, I would suggest using an OTC product with the active ingredient chlorhexidine. It is often sold under the brand name Hibiclens. You will only need a small amount of this antiseptic cleanser and should rinse thoroughly after application.

Good luck!