An overview of the consultation and diagnosis process for hair disorders

Hair disorders represent a complex medical field, with several hundred types and subtypes of recognized conditions. As our understanding of genetics and hair follicle biology continues to expand, so too will the nuances and categorizations of these conditions. However, most clinicians will encounter a limited subset of common hair diseases in their practice. This article aims to demystify the consultation and diagnostic process for hair disorders.

The Challenge for the Hair Specialist: When a patient with a hair condition enters the clinic, a dermatologist is faced with making a specific diagnosis and prescribing a treatment. Frequently patients criticize dermatologists for their apparent lack of understanding of their particular disorder. However, because of the limited research into hair diseases, it is often very difficult to make a specific diagnosis and explain the diagnosis in detail to the patient. This is especially true with rare conditions. Limited research also means that there are very few diagnostic tests or treatments available, particularly for diseases other than the most common ones listed below.

The Landscape of Hair Disorders: The most common hair complaints a dermatologist encounters include androgenetic alopecia (pattern hair loss), alopecia areata (an autoimmune disease leading to patchy hair loss), telogen effluvium (temporary diffuse hair shedding), trichotillomania/traction alopecia (hair loss from pulling or pressure), hair shaft defects from cosmetic processing, and excess hair growth (hirsutism or hypertrichosis). While there are many other types of hair diseases (a few hundred if we include genetic conditions that can cause hair abnormalities), they are relatively rare, occurring in less than 1% of the population.

The Diagnostic Process: Consultation and diagnosis of a hair disorder often involve a multi-step process. When a patient enters a clinic, the dermatologist typically employs a combination of three main methods of information gathering; history-taking, physical examination, and sometimes further testing. Some diseases, like male pattern baldness, may be immediately obvious upon visual inspection, and the dermatologist may proceed directly to discussing treatment options.

In a dedicated hair clinic such as the Hair & Beauty Treatment Center, a certified trichologist (someone who is not a doctor, but who is trained and qualified to consult on hair disorders) may provide a multi-therapeutic approach to hair loss that includes identifying the cause of the hair problem, providing nutritional advice, and prescribing topical treatments. They may also collaborate with your doctor to address any underlying medical conditions and/or to provide prescription treatments.

History Taking: The dermatologist will ask the patient about their hair loss history and lifestyle. The timing and pattern of hair loss, associated symptoms, personal or family history of similar issues, and any potential triggering events (such as childbirth, illness, or stress) can provide important clues. A dermatologist may also inquire about the patient’s diet, as deficiencies in certain nutrients can contribute to hair loss.

Physical Examination: The physical examination of the hair and scalp can reveal further details. For instance, the pattern of hair loss or thinning, the presence or absence of inflammation, and the characteristics of the hair shafts can all aid in diagnosis. Alopecia areata, for example, often presents with one or more round smooth bald patches, and may have broken-off short hairs resembling exclamation marks. A dermatologist might use a “dermatoscope” to look at your hair in detail. Dermatoscopes are essentially small microscopes that can be placed on the skin to look at skin and hair in high resolution. These days, dermatoscopes are quite sophisticated electronic devices and the hair consultant may show you your scalp and hair on a computer screen as they explain what they are seeing.

Further Testing: In some cases, the dermatologist may take samples of hair, skin, and/or blood for further testing. This can help rule out or confirm certain conditions. For example, a skin scraping can be examined under a microscope to diagnose fungal infections, or a blood test can identify hormonal imbalances or deficiencies that may be causing hair loss.

Conclusion: Understanding and diagnosing hair disorders can indeed be complex due to the multitude of types and subtypes, their diverse presentations, and the lack of in-depth research for certain conditions. However, through an effective combination of a detailed patient history, thorough physical examination, and further testing when required, dermatologists and trichologists can provide a more precise diagnosis. They also play a vital role in demystifying the complexities of hair disorders for patients. Despite the challenges presented by limited research and rare conditions, our ever-expanding knowledge in the field is gradually paving the way towards improved diagnostic tools and more effective treatments. While we still have a lot to learn about the intricacies of hair disorders, it is through continued research and the dedication of medical professionals that they continue making strides in the understanding and management of these conditions. This empowers them to provide better care, more personalized treatments, and ultimately, an improved quality of life for patients with hair disorders.


Shapiro J, Wiseman M, Lui H. Practical management of hair loss. Can Fam Physician. 2000 Jul;46:1469–77.
Tosti A, Piraccini BM. Diagnosis and Treatment of Hair Disorders: An Evidence-Based Atlas. CRC Press; 2005. 193 p.
Ross EK, Vincenzi C, Tosti A. Videodermoscopy in the evaluation of hair and scalp disorders. J Am Acad Dermatol. 2006 Nov;55(5):799–806.
Hillmann K, Blume-Peytavi U. Diagnosis of hair disorders. Semin Cutan Med Surg. 2009 Mar;28(1):33–8.
Mubki T, Rudnicka L, Olszewska M, Shapiro J. Evaluation and diagnosis of the hair loss patient: part II. Trichoscopic and laboratory evaluations. J Am Acad Dermatol. 2014 Sep;71(3):431.e1-431.e11.
Mubki T, Rudnicka L, Olszewska M, Shapiro J. Evaluation and diagnosis of the hair loss patient: part I. History and clinical examination. J Am Acad Dermatol. 2014 Sep;71(3):415.e1-415.e15.
Randolph M, Al-Alola A, Tosti A. Diagnosis of hair disorders during the COVID-19 pandemic: an introduction to teletrichoscopy. J Eur Acad Dermatol Venereol. 2021 Mar;35(3):e167–8.