Hyperpigmented Patches on the Trunk of a Nigerian Woman—Quiz Case

Pityriasis rotunda. A clinical study in Jordan: experience of 10 years

“…Our patients were of dark skin type, and the patches were darker than the surrounding skin. Clinically, the common differential diagnoses of pityriasis rotunda include tinea versicolor, tinea corporis, and erythrasma . These differential diagnoses were ruled out by a mycological examination of lesional scales and by Wood's light examination (if erythrasma is suspected).…”

Pityriasis Rotunda Diagnosed in Canada: Case Presentation and Review of the Literature

“…7 It is appropriate, however, to screen patients with type I PR for systemic disease. [10][11][12][13] To the best of our knowledge, this is the second report of PR to be diagnosed in Canada. 8 In type II PR, resolution may often be seen by adulthood; therefore, reassurance may be all that is required to manage patients and their families in those cases.…”

“…There have been six reported cases in the United States, all occurring in patients with black skin, including two American-born males. [10][11][12][13] To the best of our knowledge, this is the second report of PR to be diagnosed in Canada. 14…”

Chronic Hyperpigmented Scaly Plaques—Diagnosis

“…1 The basal layer is hyperpigmented, and the dermis may contain a lymphocytic perivascular infiltrate, eosinophils, and plasma cells. 1,7,8 They may also spontaneously resolve with treatment of underlying systemic disease. The lesions may improve with the application of topical retinoid, lactic acid, or salicylic acid.…”