A 36-year-old lady presented with an asymptomatic large pore containing black material over the right side of the abdomen of 6 months duration. Examination revealed a single papule with a central pore containing black keratotic material over the right side of the abdomen [Figure 1a]. On trying to extract the keratotic material, a black plug came out [Figure 1b] and the pore became more prominent. It was then excised and sent for histopathological examination. There was no other mucocutaneous abnormality and systemic examination was non-contributory. Histopathological examination of the lesion revealed dilated infundibulum lined by outer root sheath epithelium with infundibular keratinization and keratohyaline granules [Figures 2–4].
Figure 1.
(a) Enlarged solitary comedo containing black keratotic material. (b) Black plug that came out, on comedo extraction
Figure 2.
Dilated infundibulum lined by outer root sheath epithelium (H and E, ×40)
Figure 4.
Infundibular keratinization and keratohyalin granules (H and E, ×100)
Figure 3.
An irregular dilated cystic cavity lined by hyperplastic epithelial present in dermis (H and E, ×40)
Question
What is your diagnosis?
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