Feline Seborrhea Study Guide

Overview and Clinical Importance

Seborrhea (also called seborrheic dermatitis) is a keratinization disorder characterized by abnormal production of sebum by the sebaceous glands, resulting in excessive scaling, oiliness, and odor of the skin and coat. While less common in cats than dogs, seborrhea represents an important dermatological condition that NAVLE examinees must recognize and manage effectively.

In cats, seborrhea typically presents as a secondary condition resulting from an underlying disease process. Primary idiopathic seborrhea is rare in cats but does occur, particularly in Persian and Himalayan breeds. The clinical importance of seborrhea lies in its role as a marker for underlying systemic disease, making thorough diagnostic investigation essential.

Pathophysiology

Normal Keratinization

The epidermis undergoes continuous renewal through a process called keratinization. Keratinocytes originate in the basal layer, migrate superficially, differentiate, and eventually desquamate from the stratum corneum. This cycle normally takes approximately 21-28 days in cats. Sebum, produced by sebaceous glands, mixes with epidermal lipids to form the skin's protective barrier.