PMC5803849_01
Hyperpigmented papules over (a) forearm and (b) legs
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F1
On gross examination, lesions appeared as papules over forearms and legs [Figure 1a and b].
Circle hairs located under stratum corneum and protruding out of skin
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F2
Trichoscopy at x150 magnification showed CHs located under a thin skin layer corresponding to outer stratum corneum, whereas others were protruding out of skin [Figure 2].
Circle hairs showing a characteristic "question mark" appearance
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F3
After pulling, CH showed a characteristic "question mark" appearance [Figure 3].