PMC5396452_01
Vellus hairs present in cysts from clinical presentation case #1, a 15-year-old male patient. Cyst contents were expressed via incision and drainage and mounted with a coverslip without KOH. Scale bar = 100 microns.
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fig1
I&D expression of the few remaining lesions resulted in oily, curd-like material containing multiple vellus hairs (Figure 1).
Representative photomicrograph of a steatocystoma stained with hematoxylin and eosin (H&E) at 100x (a) and 400x (b) magnification. Abundant sebaceous input is clearly visible in the cyst wall.
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fig2
While this patient's lesions were not biopsied, a representative photomicrograph of a steatocystoma is shown in Figure 2.
PMC5396452_02
(a) Clinical presentation case #2, a 67-year-old female patient, presurgery. Numerous periorbital 1-2 mm white and yellow papules are shown. Papules inside the highlighted region (black box) were removed surgically. (b) Clinical presentation case #2, one year after surgery. No recurrence of removed papules was observed (boxed region).
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fig3
A 67-year-old Caucasian female presented with numerous 1-2 mm white and yellow papules in a bilateral periorbital distribution (Figure 3(a)), which had emerged over the course of 15 years. One year after surgery, no recurrence of the expressed cysts was noted (Figure 3(b)).
Representative photomicrograph of EVHC stained with H&E at 100x (a) and 400x (b) magnification. Keratin and numerous vellus hair shafts are visible in the cyst lumen.
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fig4
A representative photomicrograph of an EVHC lesion is shown in Figure 4.