WAIKOLOA, HAWAII -- Many dermatologists find melanonychia
to be intimidating.
The most common nail finding observed was melanonychia
[Figure 3], which was seen in 74 (37%) patients followed by onychoschizia [Figure 4], Muehrcke's lines, Mees' lines and Beau's lines.
seen with zidovudine must be distinguished from the brownish hyperpigmented stripes that are seen in HIV.
Prof Black, who now works at Lancaster University, said: "We were able to find similar vein patterns, scars, patterns of skin creases, there was evidence of a pigment condition called melanonychia
on one of his ring fingers.
"All of the features - the vein patterns, the skin creases, the scars, the presence of melanonychia
- everything matches."
Onychophagia can cause numerous nail changes, including chronic paronychia, longitudinal melanonychia
, splinter hemorrhages, nail dystrophy, and partial or total loss of nails [2, 3].
Nail change NF NC p-value Longitudinal ridging 10 20 0.047 Beau's lines 3 8 0.215 Longitudinal melanonychia
3 6 0.495 Onycholysis, focal 2 2 1.000 Pitting 3 0 0.246 Pigmentation, focal 3 5 0.721 Complete pigmentation of nail plate 0 4 0.121 Clubbing 0 1 1.000 Thickening of nail plate 2 6 0.279 Dystrophic nails 2 10 0.037 Traumatic nails 3 8 0.215 Punctuate leuconychia 2 14 0.004 Paronychia 3 8 0.215 Median canalicular dystrophy of Heller 0 6 0.038 Petechial hemorrhage 0 8 0.012 NF = number of patients in family ward, NC = number of patients in closed ward, LSC = lichen simplex chronicus, KP = keratosis pilaris.
Dermoscopy did not show typical longitudinal melanonychia
or erythronychia, irregular vascularity, or hemorrhage [Figure 1]c.
Nail Pigmentation: There is no difference in the structure of the nails in different races, the frequency of melanonychia
varies by the degree of skin pigmentation, There is a band of pigmentation on the nail plate in people of colour, extending from the nail matrix to the tip of the nail, it is absent in the fairer skin.
It was not itchy, associated with leukonychia and melanonychia
on hands and toes' nails (Figure 1).
Twenty-nine chapters are: trichoscopy patterns; normal scalp; instruments for scalp dermoscopy; nonscarring alopecias; primary scarring alopecias; hair shaft disorders; pediatric hair disorders; dermoscopy of the black scalp; hair weathering; systemic diseases; inflammatory scalp disorders; infections; parasitoses of the scalp; body hair disorders; hair root evaluation; dermoscopy-guided biopsies; ex vivo dermoscopy; dermoscopy in canine and feline alopecia; dermoscopy of the nail plate; dermoscopy of the proximal nail fold; dermoscopy of the hyponychium; dermoscopy of the distal edge of the nail plate; inflammatory nail disorders; traumatic nail disorders; brittle nails; onychomycosis; nail tumors; melanonychia
; connective tissue disorders.
Immunohistochemical study of 40 cases of longitudinal melanonychia
. Am J Dermatopathol.