In the majority of the research I’ve came across, hair loss typically accompanies seborrheic dermatitis. This is because the malassezia fungus likes to invade the hair follicules and this can get in the way of healthy hair growth. The second edition of Seborrheic Dermatitis - The Owners ManualeBook will contain a section devoted to explained the hair loss associated with SD and potential ways to resolve the issue.
Overall though, once the seborrheic dermatitis is controlled, hair loss usually returns to normal. Both Ketoconazole (Nizoral) and Pyrithione Zinc (Head and Shoulders) have been shown to help improve hair growth in a significant number of studies. Some individuals who have issues solely with hair loss even use Ketoconazole.
Hope that helps.
All the best!