Cats can safely use stainless steel bowls, and as long as owners clean them regularly, cats are unlikely to develop feline acne, also known as "black chin". It's generally not recommended to use plastic bowls for cats long-term, as these can contribute to black chin issues.

Are Stainless Steel Bowls Safe for Cats?
Stainless steel cat bowls are harmless to cats. Bowls made of stainless steel, plain white ceramic, or glass are all non-toxic, odorless, and aesthetically pleasing. Additionally, the best style of cat bowl is shallow and flat (preferably no more than 3cm high and at least 15cm wide). If you are still using plastic bowls, they can be acceptable for a transitional period, but are not advised for long-term use. Consider purchasing new pet bowls instead.
Do Plastic Bowls Cause Cat Acne?
Using plastic bowls can significantly increase the risk of cats developing feline acne. Firstly, it is recommended that owners switch to ceramic food bowls. In addition, gently wiping your cat's chin daily with a damp cloth can help. Secondly, if the cat food is too high in salt or oil, this can also contribute to black chin, so it is advisable to switch to cat food with lower oil content and high nutritional value. Finally, hormonal imbalances can also lead to feline acne. It's crucial to maintain a clean feeding environment and choose the right bowl to ensure your feline friend remains healthy.