This cat has tinea. The cat has been licking its hair since it dropped Avak, because Avak is an insect repellent. Licking your hair all the time is because you have tinea felis, so it is not symptomatic to use insect repellent. First soak and scrub the affected area with hot soapy water to soften the hard skin, then wipe it with cotton swab dipped in alcohol, disinfect the surrounding area and treat it with antifungal shampoo for external use. Vitamin supplement: provide nutritious food, improve your immunity and get more sunshine; Keep your skin dry and avoid bacterial reproduction.