A Case of Eruptive Collagenoma on the Left Calf: CASE REPORT
A 16-year-old boy presented with numerous asymptomatic papules on the left calf. The lesion first appeared at the age of 10 years and had been slowly increasing in number and size. He denied previous skin eruptions or trauma to the areas where the papules developed. He had no other significant problems in health and there was no family history of similar disorders. Physical examination revealed multiple slightly raised, yellowish grouped papules on the left calf (Fig. 1). The papules measured 3 to 5 mm in diameter. The initial clinical diagnosis was sebaceous hyperplasia, xanthoma or collagen disorders. The histological examination revealed unremarkable epidermis and slightly homogenized condensed collagen and decreased elastic fibers in the dermis (Fig. 2A). Dense fascicular bundles of collagen were highlighted by Masson’s trichrome (Fig. 2B) and decreased and fragmented elastic fibers were revealed by Verhoeff-van Gieson stain (Fig. 2C). Based on these features, the skin lesion on the left calf was diagnosed as eruptive collagenoma. No specific treatment was given. Viagra Soft Tabs
Fig. 1. Multiple 3 to 5 mm diameter sized slightly raised, yellowish grouped papules on the left calf.
Fig. 2. (A) Skin biopsy from the left calf revealed slightly homogenized condensed collagen and decreased elastic fibers in the dermis (H&E, x40). (B) Excessive accumulation of collagen in the dermis (Masson’s trichrome stain, x40). (C) Decreased and fragmented elastic fibers in the dermis (Verhoeff-van Gieson stain, x40).