Dermoscopy represents a useful technique for the diagnosis and follow-up of hair and scalp disorders. To date, little has been published regarding dermoscopy findings of hair disorders in patients of African descent. This article illustrates how dermoscopy allows fast diagnosis of hair breakage due to intrinsic factors and chemical damage in African descent patients.

Keywords:
Dermoscopy, Trichoscopy, Hair breakage, African descent, Chemical damage
1.
Lacarrubba F, Dall'Oglio F, Rita Nasca M, Micali G: Videodermatoscopy enhances diagnostic capability in some forms of hair loss. Am J Clin Dermatol 2004;5:205-208.
2.
Yin NC, Tosti A: A systematic approach to Afro-textured hair disorders: dermatoscopy and when to biopsy. Dermatol Clin 2014;32:145-151.
3.
Ross EK, Vincenzi C, Tosti A: Videodermoscopy in the evaluation of hair and scalp disorders. J Am Acad Dermatol 2006;55:799-806.
4.
Central Intelligence Agency (CIA): Long-Term Global Demographic Trends: Reshaping the Geopolitical Landscape. 2001. https://www.cia.gov/library/reports/general-reports-1/Demo_Trends_For_Web.pdf (accessed July 9, 2013).
5.
Salam A, Aryiku S, Dadzie OE: Hair and scalp disorders in women of African descent: an overview. Br J Dermatol 2013;169(suppl 3):19-32.
6.
Franbourg A, Hallegot P, Baltfenneck F, et al: Current research on ethnic hair. J Am Acad Dermatol 2003;48:S115-S119.
7.
Khumalo NP, Dawber RP, Ferguson DJ: Apparent fragility of African hair is unrelated to the cystine-rich protein distribution: a cytochemical electron microscopic study. Exp Dermatol 2005;14:311-314.
8.
Menkart J, Wofram LJ, Mao I: Caucasian hair, Negro hair and wool: similarities and differences. J Soc Cosmet Chem 1966;17:769-787.
9.
Miteva M, Tosti A: ‘A detective look' at hair biopsies from African-American patients. Br J Dermatol 2012;166:1289-1294.
10.
Thibaut S, Gaillard O, Bouhanna P, et al: Human hair shape is programmed from the bulb. Br J Dermatol 2005;152:632-638.
11.
Bernard BA: Hair shape of curly hair. J Am Acad Dermatol 2003;48:S120-S126.
12.
Syed A, Kuhajda A, Ayoub H, et al: African-American hair: its physical properties and differences relative to Caucasian hair. Cosmet Toil 1995;110:39-48.
13.
Khumalo NP, Doe PT, Dawber RP, et al: What is normal black African hair? A light and scanning electron-microscopic study. J Am Acad Dermatol 2000;43:814-820.
14.
Loussouarn G, El Rawadi C, Genain G: Diversity of hair growth profiles. Int J Dermatol 2005;44(suppl 1):6-9.
15.
Loussouarn G: African hair growth parameters. Br J Dermatol 2001;145:294-297.
16.
Sperling LC: Hair density in African Americans. Arch Dermatol 1999;135:656-658.
17.
Quinn CR, Quinn TM, Kelly AP: Hair care practices in African American women. Cutis 2003;72:280-282, 285-289.
18.
Robbins CR: Chemical and Physical Behavior of Human Hair, ed 4. New York, Springer, 2002.
19.
Miranda-Vilela AL, Botelho AJ, Muehlmann LA: An overview of chemical straightening of human hair: technical aspects, potential risks to hair fibre and health and legal issues. Int J Cosmet Sci 2013, Epub ahead of print.
20.
Syed AN: Ethnic hair care products; in Johnson DH (ed): Hair and Hair Care. New York, Marcel Dekker Inc, 1997, vol 17, pp 235-259.
21.
Osorio F, Tosti A: Hair weathering, part 1: hair structure and pathogenesis. Cosmet Dermatol 2011;24:533-538.
22.
Mirmirani P: Ceramic flat irons: improper use leading to acquired trichorrhexis nodosa. J Am Acad Dermatol 2010;62:145-147.
23.
Callender V: African-American scalp disorders and treatment considerations. Skin Aging 2002;10(suppl):12-14.
24.
Hsiung DY: Hair straightening; in De Navarre MG (ed): The Chemistry and Manufacture of Cosmetics, ed 2. Wheaton, Allured Publishing Corporation, 1993, vol 4, pp 1155-1165.
25.
Syed AN, Naqvi ARMD: Comparing the irritation potential of lye and no-lye relaxers. Cosmet Toiletries 2000;115:47-52.
26.
Velasco de Paola MVR, Ribeiro ME, Bedin V, Bonzanini V: Cabelos étnicos. Cosmet Toiletries, Ed Port 1999;11:36-44.
27.
de Sá Dias TC, Baby AR, Kaneko TM, Robles Velasco MV: Relaxing/straightening of Afro-ethnic hair: historical overview. J Cosmet Dermatol 2007;6:2-5.
28.
Wong M, Wis-Surel G, Epps J: Mechanism of hair straightening. J Soc Cosmet Chem 1994;45:347-352.
29.
Obukowho P, Birman M: Alisantes para cabelos - avaliação da função, da química e da produção. Cosmet Toiletries, Ed Port 1996;8:44-49.
30.
McMichael AJ: Ethnic hair update: past and present. J Am Acad Dermatol 2003;48:S127-S133.
31.
Bolduc C, Shapiro J: Hair care products: waving, straightening, conditioning, and coloring. Clin Dermatol 2001;19:431-436.
32.
Weathersby C, McMichael A: Brazilian keratin hair treatment: a review. J Cosmet Dermatol 2013;12:144-148.
33.
Mbulelo MH, Smith P, Khumalo N: Elevated formaldehyde concentration in ‘Brazilian keratin type' hair-straightening products: a cross-sectional study. J Am Acad Dermatol 2014;70:276-280.
34.
Draelos ZD: Commentary: healthy hair and protein loss. J Am Acad Dermatol 2010;62:409-410.
35.
Khumalo NP, Stone J, Gumedze F, McGrath E, Ngwanya MR, de Berker: ‘Relaxers' damage hair: evidence from amino acid analysis. J Am Acad Dermatol 2010;62:402-408.
36.
Miyamoto M, Tsuboi R, Oh-I T: Case of acquired trichorrhexis nodosa: scanning electron microscopic observation. J Dermatol 2009;36:109-110.
37.
Martin AM, Sugathan P: Localised acquired trichorrhexis nodosa of the scalp hair induced by a specific comb and combing habit - a report of three cases. Int J Trichology 2011;3:34-37.
38.
Hwang ST, Park BC: Trichorrhexis nodosa after hair transplantation: dermoscopic, pathologic and electron microscopy analyses. Dermatol Surg 2013;39:1721-1724.
39.
Sperling LC: An Atlas of Hair Pathology with Clinical Correlations. New York, Parthenon Publishing, 2003.
40.
Tosti A: Hair shaft disorders; in Tosti A (ed): Dermoscopy of Hair and Scalp Disorders. London, Healthcare, 2007, pp 51-69.
41.
Tosti A, Torres F: Dermoscopy in the diagnosis of hair and scalp disorders. Actas Dermosifiliogr 2009;100(suppl 1):114-119.
42.
Rudnicka L, Rakowska A, Olszewska M, Slowinska M, Czuwara J, Rusek, et al: Trichorrhexis nodosa; in Rudnicka L, Olszewska M, Rakowska A (eds): Atlas of Trichoscopy: Dermoscopy in Hair and Scalp Disease. London, Springer, 2012, pp 159-165.
43.
Rudnicka L, Rakowska A, Kerzeja M, Olszewska M: Hair shafts in trichoscopy: clues for diagnosis of hair and scalp diseases. Dermatol Clin 2013;31:695-708.
44.
Chernosky ME, Owens DW: Trichorrhexis nodosa. Clinical and investigative studies. Arch Dermatol 1966;94:577-585.
45.
Miteva M, Tosti A: Dermatoscopy of hair shaft disorders. J Am Acad Dermatol 2013;68:473-481.
46.
Burkhart CG, Burkhart CN: Trichorrhexis nodosa revisited. Skinmed 2007;6:57-58.
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2015
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