Cutaneous Infection: An Important Differential Diagnosis in the Immunosuppressed Patient with Chronic Ulcers.

In 2018, a 38-year-old woman was referred to our hospital with some nodules and nonhealing ulcers on her left thigh that had been present for 18 months. Her medical history included rheumatoid arthritis (RA) being treated with 20-mg prednisone for the last 8 years. There was no history of trauma, surgery, or cosmetic procedure on the leg.

Periungual eccrine poroma.

Background: Eccrine poroma is a rare, benign skin appendage tumor originating from the intraepidermal portion of the eccrine sweat duct, which typically occurs on the sides and soles of the feet. Nonetheless, eccrine poroma may be found in any skin area bearing sweat glands.

Objective: Herein we report a case of an eccrine poroma in an unusual location, the surgical management of the condition, and follow-up processes.

Periungual eccrine poroma.

Background: Eccrine poroma is a rare, benign skin appendage tumor originating from the intraepidermal portion of the eccrine sweat duct, which typically occurs on the sides and soles of the feet. Nonetheless, eccrine poroma may be found in any skin area bearing sweat glands.

Objective: Herein we report a case of an eccrine poroma in an unusual location, the surgical management of the condition, and follow-up processes.

The molecular fingerprint of human papillomavirus infection and its effect on the Langerhans cell population in squamous cell carcinomas of the genital skin.

Background: Information is scarce about the presence of molecular alterations related to human papillomavirus (HPV) infection in squamous cell carcinomas of the genital skin and about the effect of this infection in the number of Langerhans cells present in these tumors.

Aims: To determine the presence of HPV in genital skin squamous cell carcinomas and to see the relationship between HPV infection and changes in the expression of Ki-67 antigen (Ki-67), p53 protein (p53), retinoblastoma protein (pRb) and E-cadherin and to alterations in Langerhans cell density, if any.

Methods: A descriptive, comparative, retrospective and cross-sectional study was performed with all the cases diagnosed as squamous cell carcinomas of the genital skin at the Dermatopathology Service from 2001 to 2011.

Evaluation of Demodex folliculorum as a Risk Factor for the Diagnosis of Rosacea In Skin Biopsies. Mexico's General Hospital (1975-2010).

Context: Rosacea significantly affects the quality of life and its pathophysiology is not well understood. It has been suggested that the presence of Demodex folliculorum in the affected skin could be related to the development of rosacea.

Aims: To study the risk for association between the presence of D.

Skin biopsy: a pillar in the identification of cutaneous Mycobacterium tuberculosis infection.

Introduction: The present study aimed to establish the frequency and clinical characteristics of cutaneous tuberculosis among Mexican adult patients.

Methodology: Ninety-five patients with clinically compatible lesions to cutaneous tuberculosis participated in the study. All patients were HIV negative and none of them had previous anti-TB treatment.

Comparison of direct microscopy, culture and calcofluor white for the diagnosis of onychomycosis.

Background: Mycological diagnosis of onychomycosis can be performed by direct microcopy (KOH), cultures and calcofluor white.

Aims: To compare the percentage of positivity and the degree of correlation of KOH, cultures and calcofluor white for the diagnosis of onychomycosis.

Methods: Descriptive, transversal and comparative study.

[Classic dissemination of Kaposi's sarcoma: report of a case].

An 86-year-old male presented with a disseminated dermatosis characterized by erythematous and violaceous papules and nodules of 0.5-1.0 cm in diameter.

Giant skin tags: report of two cases.

Skin tags are skin-colored, pedunculated tumors with a smooth surface. Histologically are composed by loose collagen fibers and dilated capillaries. Giant skin tags are reported rarely in the literature.

Myxoid neurofibroma: an unusual presentation.

Myxoid neurofibroma (MN) is a benign tumor of perineural cell origin, which is demonstrated with a positive immunohistochemical staining for S-100 protein. The most common locations of the MN are the face, shoulders, arms, periungual and in the feet. To our knowledge, this is the first time that a trunk location is reported.

Annular atrophic lichen planus.

A 30-year-old woman presented with a 1-year history of a pruritic eruption on the extremities, characterized by several annular plaques. The patient had been treated unsuccessfully with medium-potency topical steroids. The lesions had an erythematous papular border with an atrophic center (width, 1-4 cm) (Fig.