Hello there. I have two 9 month old kittens who are siblings and one of them is constantly getting feline acne under her chin and around her mouth. I think her fur might be more oily than the other one because both have different fur textures. I'm not certain as to why she's getting it and it doesn't seem to itch or bother her from what i can tell because I never see her scratch it, but it always is there and popping up. I change their bowls out and wash them about every four days and they've always eaten the same brand of food. Any advice on how to eliminate it? My vet wasn't too much help she really just pointed it out and that was it, didn't give me any advice on how to prevent it.