Some of the conditions Trichologists treat are dandruff, psoriasis, seborrhea dermatitis, dry, oily or itchy scalp, hair loss hair breakage and hair thinning to name a few. I've never heard of it until recently. Trichology was started in London, England in 1902.
Consultation takes place at the forefront of all professions.
For example, when one enters a restaurant, a waiter or waitress, consults with the patron in order to give the needed service. In addition to Dermatologists there are M.D's, Internal M.D's, Endocrinologists, Dentists, Nutritionists, Psychiatrists, Cosmetologists and other Trichologists. This is true in many instances. The hair responds like a barometer for the body. When hair is shedding it is like a red light for a Trichologists, indicating something internally is out of balance.