The yellow mouth of a kitten may be caused by folliculitis. You can wipe it with alcohol. At the same time, you need to improve the cat’s diet. Do not let the kitten eat cat food or other foods that are too salty and oily. Let the kitten drink more. Water, and the kitten should wipe its mouth clean after eating, so that the yellow color around the mouth can be removed after a period of time. If the folliculitis does not improve, you can use ointments that treat folliculitis.