[Acute urticaria].

Background: Urticaria is characterized by the transient appearance of hives, angioedema, or both. Acute urticaria lasts less than 6 weeks. The origin is idiopathic in more than 50% of cases, and the most frequent triggers are infectious processes, drugs and foods.

Analysis of the heat shock protein 70 (HSP70) genetic variants in nonsegmental vitiligo patients.

Background: Vitiligo is an autoimmune disease that courses with skin depigmentation because of the destruction of melanocytes. Vitiliginous melanocyte is prone to damage because of oxidative stress which activates cellular stress response and the release of heat shock proteins such as HSP70 promoting immune activation against the melanocyte. Variants in HSP70 genes (HSPA) might alter their expression and thus modulate vitiligo susceptibility.

Catalase but not vitamin D receptor gene polymorphisms are associated with nonsegmental vitiligo in Northwestern Mexicans.

Background: Vitiligo is an acquired pigmentation disorder characterized by melanocyte loss via autoimmune mechanisms triggered by oxidative stress. Gene polymorphisms in antioxidant enzymes and immunomodulators such as catalase (CAT) and vitamin D receptor (VDR), respectively, have been linked to vitiligo in European and Asian populations. Our aim was to evaluate the role of CAT and VDR gene polymorphisms as well as CAT and vitamin D in nonsegmental vitiligo in Northwestern Mexicans.

Efficacy of topical clotrimazole vs. topical tolnaftate in the treatment of otomycosis. A randomized controlled clinical trial.

Introduction: Otomycosis, an infection of the ear canal by fungi, is prevalent in hot and humid weather. Nevertheless, there is not sufficient evidence for the effectiveness of different topical antifungal treatments. Tolnaftate, is a topical antifungal agent described to be effective in the treatment of otomycosis.

Protothecosis.

Protothecosis is a rare infection caused by achlorophyllic algae that are members of the genus Prototheca. They are ubiquitous in nature in organic material. The clinical manifestations can be acute or chronic and local or disseminated.

[Chromomycosis: report of a case with unusual topography].

Background: Chromomycosis is a subcutaneous mycosis caused by dematiaceous fungi. It is characterized by the presence of nodules, verrucous and atrophic lesions, and is prevalent in tropical and subtropical areas. Mexico ranks third among the subcutaneous mycoses, mainly affecting the lower limbs.