Trichologists are specialists in the scalp and hair. A Dermatologist is a medical doctor who has specialised in skin – all over the body, not just the scalp.
Dermatologists within the NHS are under pressure of targets to see all suspected skin cancer patients within a short time. Therefore, if you wish to consult an NHS dermatologist about your scalp problem, you are likely to have a long wait indeed. Also, to consult a dermatologist under the NHS you will need a referral from your GP, whereas you may consult a trichologist immediately and you do not need a referral (although some GPs will refer patients to a trichologist).
A Qualified Trichologist can reduce the work of a GP and dermatologist by offering services to accurately diagnose a condition. If a biopsy is required a Qualified Trichologist can produce documents for a GP to refer you.