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Letter to the Editor - Observation Letter
2018:84:1;95-97
doi: 10.4103/ijdvl.IJDVL_285_17
PMID: 29176253

Dermoscopy and scanning electron microscopy in two cases with hair shaft damage secondary to hair straightening

Feroze Kaliyadan1 , BB Gosai2 , Walid Naief Ali Al Melhim2 , Hani Mohammed Al Rasasi2 , P Joel Kuruvilla1
1 Department of Dermatology, Faculty of Dermatology, College of Medicine, King Faisal University, Hofuf, Kingdom of Saudi Arabia
2 Department of Biomedical Sciences, College of Medicine, King Faisal University, Hofuf, Kingdom of Saudi Arabia

Correspondence Address:
Feroze Kaliyadan
Department of Dermatology, College of Medicine, King Faisal University, 31982 Hofuf
Kingdom of Saudi Arabia
How to cite this article:
Kaliyadan F, Gosai B B, Al Melhim WN, Al Rasasi HM, Kuruvilla P J. Dermoscopy and scanning electron microscopy in two cases with hair shaft damage secondary to hair straightening. Indian J Dermatol Venereol Leprol 2018;84:95-97
Copyright: (C)2018 Indian Journal of Dermatology, Venereology, and Leprology

Sir,

We present two cases of hair shaft damage, apparently induced by physical and chemical factors, showing characteristic features on dermoscopy and scanning electron microscopy.

Two female patients, 21 and 18 years of age, both with a primarily curly hair type, presented to the dermatology out-patient department with complaints of hair breakage, which became worse over the last few weeks. Both patients gave a history of frequent hair straightening using both thermal and chemical means. The patients were also using shampoos frequently. There was no history of hair colouring in both the patients. Both patients were otherwise healthy, with no other significant skin or systemic disease. There was no family history of any significant hair, skin, or systemic disorders.

Clinical examination revealed relatively normal hair density [Figure - 1]a and [Figure - 2]a with brittle hair and a few isolated nodes. Dermoscopy of the hair shaft showed intermittent bright yellow areas over the hair shaft and trichorrhexis nodosa [Figure - 1]b and [Figure - 2]b. Trichoptilosis was also seen. Scalp examination was otherwise normal. Light microscopy using a dissection microscope (10×–50×) showed varying degrees of hair shaft damage – including trichorrhexis nodosa and trichoptilosis [Figure - 1]c and [Figure - 2]c. There was no evidence of any bubbles in the hair. Scanning electron microscopy (scanning of platinum-coated hair specimens was carried out using a scanning electron microscope Model: JSM 6390 LA, JEOL, at 15–20 kV) showed various stages of hair shaft damage ranging from irregular overlay and lifting up of the cuticle to the typical fractured hair shaft in an area of trichorrhexis nodosa [Figure - 1]d, [Figure - 1]e, and [Figure - 2]d.

Figure 1: (a) Patient A: Clinical image showing relatively normal hair. (b) Patient A: Dermoscopy polarized light DermLite Foto II Pro with Canon 650D SLR showing multiple area of yellowish discoloration, weathering, and fractured ends ×100. (c) Patient A: Dissection microscopy showing trichorrhexis nodosa ×200. (d) Patient A: Scanning electron microscopy showing trichorrhexis nodosa ×500. (e) Patient A: Scanning electron microscopy showing cracks in the hair shaft (Patient A) ×1000
Figure 2: (a) Patient B: Clinical image. (b) Patient B: Dermoscopy polarized light DermLite Foto II Pro with Canon 650D SLR showing multiple area of yellowish discoloration, weathering, and fractured ends ×100. (c) Patient B: Dissection microscopy showing trichoptilosis ×200. (d) Patient B: Scanning electron microscopy showing irregular overlay and lifting up of cuticles ×1500

Laboratory investigations of both patients – including complete blood count, iron and ferritin levels, thyroid functions tests and vitamin D levels – were within the normal limits.

A clinical diagnosis of hair shaft damage secondary to chemical and physical factors was made and both patients were advised to completely stop hair-straightening procedures, as well as minimize the use of shampoos. Regular use of hair conditioners was advised.

Hair shaft damage secondary to hair straightening has been reported to be common in people of African descent. Hair straighteners can remove the monomolecular layer of fatty acids covalently bound to the cuticle, leading to changes in water permeability and hair shaft damage. The breakage and rearrangement of disulfide bonds can also contribute to hair shaft damage.[1],[2] The risk for such hair shaft damage is more in curly hair seen in people of African descent. This is partly due to inherent factors, like a relatively low level of cysteine in the hair.[3],[4] Recently, dermoscopy has been shown to be a useful tool in detecting the hair shaft damage early.[1],[5]

We propose that the yellow areas seen on dermoscopy probably indicate early signs of hair shaft damage – areas that are likely to develop complete fractures later. Although the trichoscopic features of damaged hair have been well described, to the best of authors' knowledge, the intermittent yellowish pat ches on the hair shaft on polarized light dermoscopy as a possible early marker of shaft damage has not been previously described. These two cases highlight the usefulness of dermoscopy in assessing the extent of hair damage in patients presenting with significant hair shaft damage secondary to chemical or physical factors.

Acknowledgements

The funding for the electron microscopy procedure was from a research grant given by the Deanship of Scientific Research, King Faisal University (Research Grant Number: 150100).

Financial support and sponsorship

Nil.

Conflicts of interest

There are no conflicts of interest.

References
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Draelos ZD. Commentary: Healthy hair and protein loss. J Am Acad Dermatol 2010;62:409-10.
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Yin NC, Tosti A. A systematic approach to Afro-textured hair disorders: Dermatoscopy and when to biopsy. Dermatol Clin 2014;32:145-51.
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Khumalo NP, Dawber RP, Ferguson DJ. Apparent fragility of African hair is unrelated to the cysteine-rich protein distribution: A cytochemical electron microscopic study. Exp Dermatol 2005;14:311-4.
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