Biting the cat's hair when grooming does not necessarily mean there are bugs, it may also be tangled hair. It is best to check the cat's body for parasites, scabs, hair loss, dander, etc. If it is possible, it may be cat moss. Or caused by other skin diseases, which require spray treatment. You should bathe your cat regularly, comb its hair, keep its hair clean, and perform external deworming on a regular basis to avoid infection with parasites or fungi.