A case of tinea incognita and differential diagnosis of figurate erythema

Annular and acral/facial dyskeratotic paraneoplastic disorders

Annular and acral/facial dyskeratotic paraneoplastic disorders are inflammatory dermatoses that occur in association with distant cancers but are not precursors, extensions, or metastases of them. There are four classical entities under this rubric: two gyrate entities, erythema annulare centrifugum and erythema gyratum repens, and two acral/facial dyskeratotic entities, acrokeratosis paraneoplastic (Bazex syndrome) and tripe palms. Each of these entities may also occur in association with another etiopathogenesis and may present either as a classical entity or as a barely recognizable disease. We discuss these entities, their associated causes, and their differential diagnoses in turn.

Mimics of Dermatitis

Dermatitis is a common condition frequently encountered by dermatologists. The diagnosis of dermatitis can be challenging because this condition is often multifactorial, and many skin diseases that can mimic dermatitis should be considered in the differential diagnosis. It is important to recognize and be familiar with these conditions because some of them can represent signs of systemic disease or malignancies and misdiagnosis can lead to mismanagement and adverse outcomes for the patient.

Figurate erythemas - update and diagnostic approach

Figurate erythemas (FE) represent an etiopathophysiologically heterogeneous group of diseases defined by their characteristic annular erythematous skin lesions. Diagnosis is made primarily by clinical examination together with histological findings; often it is a diagnosis made by exclusion. While some authors discuss FE as clinical reaction pattern rather than distinct clinical entities, others identify four classic FE: erythema annulare centrifugum, erythema gyratum repens, erythema migrans and erythema marginatum. The differential diagnoses of FE are numerous and often challenging. We therefore present a potential diagnostic algorithm for FE that discriminates the differentials according to their temporal evolution and the clinical/histological phenotype of the various subtypes. Since some FE may present with an underlying malignancy, diligent clinicians are needed when dealing with those entities.