PMC5803851_01
Multiple, 1-2-mm, hyperpigmented papules on the flexor aspect of forearm
IJT-10-31-g001.jpg
PMC5803851_01_IJT-10-31-g001.jpg
F1
Physical examination revealed multiple discrete, reddish-brown-colored, 2-3 mm sized dome-shaped hyperpigmented papules [Figure 1].
Acyst is seen in the lower dermis lined by flattened squamous epithelium(H and E, x4)
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PMC5803851_01_IJT-10-31-g002.jpg
F2
On microscopic examination, a cyst lined by two to three layers of squamous epithelium was noted in the lower dermis [Figure 2].
(a) Cyst cavity containing laminated keratinous material and multiple vellus hair shafts(H and E, x10). (b) Cyst lining showing the presence of granular layer(arrow) and containing numerous vellus hairs and keratinous material(H and E, x40)
IJT-10-31-g003.jpg
PMC5803851_01_IJT-10-31-g003.jpg
F3
The cyst cavity contained abundant laminated keratinous debris, and numerous vellus hair shafts were identified [Figure 3a and b].