The blackening of the cat's chin may be caused by folliculitis, improper diet, improper care, etc. The cat's living environment and used items must be cleaned and disinfected regularly to reduce the growth of bacteria. During this period, adjust the cat's diet and do not give If a cat eats food with high oil and salt content, if it is caused by folliculitis or other diseases, it is best to go to the pet hospital for examination and use medication under the guidance of a veterinarian to help the cat recover.