Q. I just noticed yesterday one of my cats has a black spot on the lower gums. She eats good, still plays, but I see her more at the water dish.
A. The water drinking is the most concerning thing to me. This could indicate diabetes or kidney disease. I recommend getting her in to see your vet for an exam and labwork to check her system functions. Based on these results, your vet can better advise you on treatment if needed. If there is nothing wrong with her, this labwork is still valuable in providing a baseline by which to compare future labwork in case there are developing changes in the future.