Small black spots at the roots of the cat’s hair may be folliculitis or parasite feces. First, you need to check whether there are parasites on the cat. If there are parasites, you need to bathe the cat in time to deworm the cat. If there are no parasites, then the diet For folliculitis caused by improper use or endocrine disorders, the cat needs to improve its diet and feed it some light and easy-to-digest food. Do not feed cat food that is too oily.