Hair pain (trichodynia): frequency and relationship to hair loss and patient gender.

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Dermatology 2002;205(4):374-7

Hair pain (trichodynia): frequency and relationship to hair loss and patient gender.

Background: Patients complaining of hair loss frequently claim that their hair has become painful. Objective and Methods: The aim of the study was to evaluate the frequency of this phenomenon and its relationship to hair loss. Patients seeking advice for hair loss either spontaneously reported or were questioned about painful sensations of the scalp. Hair loss activity was quantified by a hair pull, daily count and wash test. Telogen percentage was obtained by a hair pluck. The scalp surface was examined by dermatoscopy. Results: Of 403 examined patients, 20% of women and 9% of men reported hair pain, irrespective of the cause and activity of hair loss. A minority presented scalp telangiectasia. This strongly correlated with hair pain. Conclusions: Hair pain (trichodynia) affects a significant proportion of patients complaining of hair loss and may increase the anxiety. The symptom neither allows discrimination of the cause nor correlates with the activity of hair loss. A higher prevalence of female patients might be connected to gender-related differences in pain perception in relation to anxiety. The role of vasoactive neuropeptides in the interaction between the central nervous system and skin reactivity is discussed. In the absence of any correlation with quantitative parameters of hair loss or specific morphologic changes of the scalp, management remains empiric and tailored to the individual.

Ann Dermatol Venereol 2002 May;129(5 Pt 2):787-92

Hormonal interaction and hair growth

Androgenetic alopecia (AGA) is the most common form of hair loss in men and women. This continuous process results in a form of alopecia that follows a definite pattern in those individuals who are genetically predisposed. Although clinically different, the pathogenetic pathways leading to this type of hair loss are thought to be similar in both sexes. A genetic predisposition is a feature of AGA, but the predisposing genes are still unknown. Our understanding, however, of the hormonal effects on hair growth is far more advanced. AGA can be defined as a dihydrotestosterone (DHT)-dependent process with continuous miniaturization of sensitive hair follicles. So far, we do not understand the molecular steps involved in androgen-dependent beard growth versus androgen-dependent hair loss. However, the local androgen metabolism plays a central role in the intrafollicular conversion of weak androgens, such as DHEAS, to more potent androgens such as T or DHT within the hair follicle. The dermal papilla plays a central role by exhibiting an array of important steroidogenic isoenzymes. Provided that the dermal papilla (DP) cell triggers and regulates the growth of hair follicles, this physiological role may be reflected by metabolic differences, which could account for differences in androgen sensitivity as observed in hair follicles from different body sites, and in conditions such as male pattern baldness. The observation of STS, 17beta-HSD, 3beta-HSD, 3alpha-HSD and type 2 5alpha-R-activity within the DP could be a clue to understanding the regulation of androgen action in the human hair follicle by local androgen modification on target cell level. Hence, some of the intrafollicular steroidogenic enzymes would be potential pharmaceutical targets for the treatment of AGA or hirsutism.

Pediatr Dermatol 2002 Jul-Aug;19(4):298-301

A clinical study of childhood alopecia areata in Singapore.

Alopecia areata (AA) is a common cause of nonscarring alopecia. The aim of this epidemiologic study is to review the clinical characteristics and treatment of childhood alopecia areata in a mixed ethnic population. The study population consisted of a total of 392 children seen over a 4-year period with AA diagnosed before the age of 16 years. The female:male ratio was 1:1.4. There were 309 Chinese (78.8%), 51 Malays (13.0%), and 32 Indians (8.2%). The mean age at the time of diagnosis was 11.2 years. The majority of patients (71.7%) had alopecia of less than 6-months duration and 6% had previous episodes of AA. Females appeared to have more severe involvement. A familial history of AA was observed in 33 patients (8.4%). Associated atopy was found in 26.6% of patients and in 32.3% of their first-degree relatives. Other associations such as vitiligo or Down syndrome were rare. For limited AA, topical and/or intralesional corticosteroid was the first-line treatment used and squaric acid dibutyl ester was the choice of treatment for patients with extensive involvement. The profile of the poor respondents to therapy included young age of onset, past history of AA, Down syndrome, and extensive involvement.

Lasers Surg Med 2002;30(2):127-34

Hair removal with the long pulsed Nd:YAG laser: a prospective study with one year follow-up.

BACKGROUND AND OBJECTIVE: The aim was to investigate the efficacy, side effects, and the long-term results of a long pulsed Nd:YAG-Laser for hair removal in different hair colors and skin types. STUDY DESIGN/MATERIALS AND METHODS: We performed a prospective clinical study with 29 volunteers. Treatment was performed on the lower leg with a long pulsed Nd:YAG-Laser. Five test areas were treated 1-5 times in monthly intervals; one served as control. Follow-up investigations were performed at each session, and 3, 6, and 12 months after the last therapy. No depilatory treatment except shaving was allowed during the time of follow-up. Percentual hair loss, short- and long-term side effects, and pain during the treatment were evaluated. RESULTS: After one month, a hair loss of greater than 50% was found in 44.9% of the areas treated once. With up to five treatments, this percentage increased up to 71.5%. One year after therapy, a greater than 50% hair reduction was still present in 40% of the five-treatment-areas and in 0% of the areas treated only once. There were no permanent side effects despite one small scar after a folliculitis. CONCLUSIONS: The long pulsed Nd:YAG is suitable to remove hair for more than 12 months effectively, although 4-5 sessions are necessary for these results. Blond hair can also be removed, although much less effective. No lasting side effects could be seen. Darker skin types or tanned skin can also be treated without side effects. A cooling may be advisable due to the pain reported by the volunteers.

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