Delayed diagnosis of adult-onset mastocytosis.

Urticaria pigmentosa is most frequently observed in children. The associated symptomatology in mastocytosis is vague and not always diagnostic, and Darier's sign is often negative, making the diagnosis challenging. We describe a case of a 61-year-old man with extensive brown papules and macules in different locations of the body that slowly progressed in the last 10 years with a previous anaphylactic reaction after an ant bite. This suggests that urticaria pigmentosa in an adult should be furthered assessed for the possibility of systemic involvement for a correct diagnosis and treatment.

Indeterminate Cell Histiocytosis Mimicking Rosacea.

Indeterminate cell histiocytosis (ICH) is a rare proliferative disorder of histiocytes, which display morphologic and immunophenotypic characteristics of both Langerhans cell histiocytosis (LCH) and non-Langerhans cell histiocytosis (NLCH). We describe an unusual clinical presentation of ICH mimicking rosacea and provide a relevant review of the literature.

A Rare Presentation of Nodular Amyloidosis on the Lower Back.

Primary localized cutaneous amyloidosis (PLCA) occurs when amyloid is deposited only within the skin and there is no evidence of systemic involvement. Nodular amyloidosis is the rarest subtype of PLCA. It typically involves the acral regions but can sometimes present on the head and neck. The condition usually presents clinically as a single tan or yellow nodule or plaque that may appear waxy. Herein, we present a rare case of a 66-year-old man with nodular amyloidosis on the lower back.

Fluoroscopy-induced chronic radiation dermatitis: a report of three cases.

We report these cases to emphasize the importance of recognizing fluoroscopy as a cause of radiation dermatitis. The diagnosis of fluoroscopy-induced chronic radiation dermatitis should be raised when patients present with morpheaform, telangiectatic, or ulcerative skin findings in the characteristic locations.