PMC10332365_01
(A) Pale red macules and papules on the left thigh with brown ring-like elevations around the edges, with a little adherent scaling. (B) Pale red macules and papules on the right thigh with brown ring-like elevations around the edges, with a little adherent scaling.
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The rash was mildly atrophic in the middle, with brown ring-like elevations around the edges and a few adherent scales (Figure 1A and B).
Epidermal hyperplasia with focal dyskeratosis, visible as a plate of dyskeratosis (HE, x100).
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Pathological examination shows epidermal hyperplasia with focal hyperkeratosis and the formation of a plate of hyperkeratosis (ie conical plate) (Figure 2).
Lymphocytic and eosinophilic infiltration around blood vessels in the dermis (HE, x200).
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The superficial dermal layer was pigmented and incontinent, with focal lymphocytic and eosinophilic infiltration around the blood vessels in the dermis (Figure 3).
Darkening of erythema on both lower extremities and flattening of the papular ring elevation.
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At a follow-up visit half a month later, the patient's pruritus had decreased, the erythema on the extremities had darkened and the papular ring of elevations had flattened (Figure 4).
Only brown pigmentation was left on the erythema of the left thigh.
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Only light brown pigmentation was left on the erythema of the extremities and the pruritus had largely disappeared (Figure 5).