Dapsone (4,4'‐diaminodiphenylsulfone) is the only remaining sulfone used in anthropoid therapeutics and is commercially available as an oral formulation, an inhaled preparation, and a 5% or 7.5% cream. Dapsone has antimicrobial effects stemming from its sulfonamide‐like ability to inhibit the synthesis of dihydrofolic acid. It also has anti‐inflammatory properties such as inhibiting the production of reactive oxygen species, reducing the effect of eosinophil peroxidase on mast cells and down‐regulating neutrophil‐mediated inflammatory responses. This allows for its use in the treatment of a wide variety of inflammatory and infectious skin conditions. Currently in dermatology, the US Food and Drug Administration (FDA)‐approved indications for dapsone are leprosy, dermatitis herpetiformis, and acne vulgaris. However, it proved itself as an adjunctive therapeutic agent to many other skin disorders. In this review, we discuss existing evidence on the mechanisms of action of dapsone, its FDA‐approved indications, off‐label uses, and side effects.

The clinical and histologic findings of the 44 SS patients in our study are generally comparable to those published in the literature, with some differences.

This was the first study to assess the prevalence of MBS in Lebanese subjects with psoriasis and, to our knowledge, the first study that showed a higher likelihood of MBS in patients with inverse psoriasis and with nail pitting.

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Two cases of acrokeratoelastoidosis comprised of smooth shiny papules on the hands, feet and legs, are reported. Focal acral hyperkeratosis, degenerative collagenous plaques of the hands and keratoelastoidosis marginalis of the hands are three closely related conditions.