Extrafacial Acquired Dermal Melanocytosis: An Exceptionally Rare Example With Bilateral Multifocal Disease.

Dermal melanocytoses are a group of cutaneous disorders characterized by the presence of ectopic melanocytes in the dermis; the most well-known example is the Mongolian spot. Acquired dermal melanocytosis (ADM) is a term used to describe the onset of dermal melanocytosis occurring after its usual age of presentation (i.e., birth and infancy). ADMs usually occur on the face and can less commonly affect extrafacial sites, such as the back and limbs. Purely extrafacial ADM is extremely uncommon and, when present, is usually unifocal. Herein, we present an exceptionally rare example of purely extrafacial ADM with extensive bilateral involvement in a 44-year-old female originally from the Philippines.

Slow-growing and Linearly Spreading Cutaneous Lesion: Often Misdiagnosed Mycobacterium Marinum Infection.

Mycobacterium marinum is a slow-growing atypical mycobacterium. It is a photochromogen; when exposed to light, it produces yellow pigment. In humans, it manifests as a localized granuloma or sporotrichotic lymphangitis. Patients at risk include anglers (commercial, recreational), oyster workers, swimmers, aquarium workers, and individuals with aquariums in their homes. Herein, we report a case of a Mycobacterium marinum infection which was misdiagnosed because there was no histopathological evidence of acid-fast bacilli and the slow growth rate in cultures.