PMC9629542_01
Brown patches involving the right abdomen, bilateral thighs, and right lower leg: (a) anterior view and (b) posterior view.
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Clinical examination was significant for multiple, well-demarcated hyperpigmented patches with irregular borders that had a "splashed on" appearance (Figure 1(a) and (b)) and some areas of hypertrichosis (Figure 2(a) and (b)) on the trunk and bilateral lower extremities, extending below the knee.
Close examination shows hypertrichosis over hyperpigmented patches: (a) lower leg and (b) abdomen.
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Clinical examination was significant for multiple, well-demarcated hyperpigmented patches with irregular borders that had a "splashed on" appearance (Figure 1(a) and (b)) and some areas of hypertrichosis (Figure 2(a) and (b)) on the trunk and bilateral lower extremities, extending below the knee.
Punch biopsy (H&E) showing epidermal acanthosis, regular elongation of the rete ridges, hyperpigmentation of the basal layer, and an increase in the number of arrector pili muscles.
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A 4-mm punch biopsy from the right posterior hip over a hyperpigmented patch showed epidermal acanthosis, regular elongation of the rete ridges, hyperpigmentation of the basal layer, and an increase in the number of arrector pili muscles (Figure 3).