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Myopericytoma is an uncommon benign neoplasm that arises from the perivascular myoid cells. It typically presents as a painless well-circumscribed cutaneous or soft-tissue nodule, most commonly on the extremities of adults. Histologically, it is characterized by spindle-shaped myoid-appearing cells with a concentric arrangement in vessel walls, that are immunoreactive to alpha-smooth muscle actin and often for h-caldesmon, but negative for other smooth muscle markers. Herein, we present an unusual case of a painful subungual myopericytoma presenting as a dark subungual discoloration.

Becker nevus, first described by Samuel William Becker in 1949, is a focal epidermal hypermelanotic disorder. It commonly presents as a unilateral hyperpigmented patch that is predominantly distributed on the upper trunk and proximal extremities and frequently associated with hypertrichosis. There have been few reports in the literature of Becker nevus with bilateral involvement; multiple Becker nevi is also unusual. Herein, we report a young man with two bilateral symmetrical giant Becker nevi, one on the trunk with extension to both arms and the second on the abdomen.

This article discusses a case of allergic contact dermatitis (ACD) caused by a rotigotine transdermal therapeutic system (TTS) in a patient with Parkinson's disease. The allergic reaction was attributed to sodium metabisulphite, an excipient in the TTS. Patch tests confirmed the diagnosis of ACD to sodium metabisulphite. The article emphasizes the importance of patch testing in diagnosing contact dermatitis associated with TTS and highlights the need for awareness of potential allergens, including excipients, in transdermal patches. [Extracted from the article]

Onychomatricoma is a rare benign tumor of the nail matrix, characterized by finger-like projections that invade the nail plate. The fingernails of Caucasian women are most commonly affected. Because this tumor can easily mimic other more prevalent ungual diseases, it is crucial to be acquainted with its characteristic clinical and histopathologic features. The authors present a case of a 40-year-old man with an onychomatrichoma in the fourth left toenail, which was initially misdiagnosed and treated as onychomycosis. [ABSTRACT FROM AUTHOR]

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