c195acfe_f_Hair_Loss__Alopecia__in_Cats__Diagnosis
[Condition] Stud tail (tail gland hyperplasia) [Description] A sebaceous gland (on the top of the tail near its base) enlarges; most often occurs in confined, unneutered males [Symptoms] Oily area, hair loss, and crusts on area over gland; may become hyperpigmented [Treatment] Castration usually does not resolve the condition; antiseborrheic shampoos, retinoids; if confined, allow cat more freedom [Diagnosis] 
Clinical signs
Causes of Hair Loss (Alopecia) in Cats
Diagnosis