[Condition] Hyperthyroidism [Description] Approximately 1/3 of cats with this disease will have skin lesions; caused by excess secretion of thyroid hormone [Symptoms] Hair loss; hair easily pulled out; seborrhea; cats may overgroom and cause 'hot spots' [Treatment] Remove part of thyroid; radioactive iodine therapy; methimazole [Diagnosis] 
Physical exam; blood testing for thyroid hormones