这个我还真不知道啊，我除了体检不进医院的啊。。。找到篇相关文章， 好像是trichologist 。。

Premature Greying Of Hair (White Hair) - Treatment, Symptoms & Risk Factors (richfeel.com)

Premature Greying Of Hair Cure

A Clinic Expert will help you identify reasons for white hair before the age of 30. Patients under professional guidance will need to approach a specialist, for identifying the exact reasons for premature greying of hair.

Overall, it is a methodical procedure for holistic treatment of premature greying hair.

• First and foremost, it is very important to establish the trust link between the trichologist and the patient. Once you visit the clinic to raise concerns about premature greying of hair, you should ideally focus on sharing each and every detail about your problem with the attending trichologist, to understand your concern.
• The next step is a physical examination to do a rough evaluation on the percentage of greying in different anatomical areas of the scalp. Your clinical evaluation of premature greying will also involve determining factors like whether body hair is involved or not in the greying of hair process.
• Depending upon genetic susceptibility, the age of the patient and nutritional status of the patient, a clear objective is set to identify reasons for white hair and causes of white hair on a personal level.
• The next step towards prevention of premature greying is giving a specific amino acid needed in hair pigment synthesis, to be used as an internal supplement for one-year along with vitamin B complex. If needed, iron supplements are also prescribed.
• Post this, regular examination confirms the successful arrest of premature greying of hair.
• In young adolescents, at times, even colour changes are seen. The benefit of the treatment of white hair in young age is observed even after the treatment.
• Deterrent factors, which must and can still lead to premature greying of hair, are explained to the patient so that caution can be maintained to prevent relapse.
•