trichology       
noun [ U ] uk/trɪˈkɒl.ə.dʒi/ us/trɪˈkɑː.lə.dʒi/
 毛发学,毛发科
the study and treatment of the hair and scalp (= the skin on the top of the head)
  She needed a year of dermatology and trichology treatment to restore hair growth. 她需要一年的皮肤科、毛发科治疗来恢复头发生长。 
 Trichology does not just mean trying to come up with the best cure for baldness. 毛发学并不仅仅意味着试图找到治疗秃顶的最佳方法。 
 - More examples
 - Trichology is a new field of study involving hair and scalp conditions.
 - Get a hair loss diagnosis from our trichology expert.
 - She had completed a correspondence course in trichology with a college in Adelaide.