A cat suffering from allergic dermatitis may scratch, lick and chew on its skin excessively. It will scratch, lick or chew on its paws, head, neck, ears and base of tail. You may observe red, raised scales on the skin. Sometimes, bumps or pus filled vesicles may be observed. Take your cat to the vet immediately for treatment. Identify the allergen triggering this skin problem and try to keep your cat away from it in future.