Genetic ancestry of patients with porphyria cutanea tarda in a country with mixed races: a cross-sectional study (Rio de Janeiro - Brazil).

Porphyria cutanea tarda has a complex etiology with genetic factors not completely elucidated. The miscegenation of the Brazilian population has important implications in the predisposition to diseases. There are no studies concerning the genetic ancestry of patients with porphyria cutanea tarda from a mixed population.

Analysis of mutations in the PIK3CA and FGFR3 genes in verrucous epidermal nevus.

Verrucous epidermal nevi are congenital hamartomas composed of keratinocytes and may occur alone or in association with developmental abnormalities. A close relationship between variations in the PIK3CA and FGFR3 genes and the appearance of nevi has been recently reported. Based on that, we performed molecular assays for the identification of E542K, E545G/K and H1047R mutations in the PIK3CA gene and of the R248C mutation in the FGFR3 gene.

Case for diagnosis.

Vascular leiomyoma are uncommon benign smooth muscle tumors which generally present as a single painful nodule in the lower limbs. We report a case of vascular leiomyoma on the second finger of the left hand, an unusual location for this tumor.

Majocchi's granuloma.

We report the case of a man of 45 with superficial dermatophytosis longtime inadvertently treated with antibiotics and corticosteroids with subsequent progression to the deep form, known as granuloma Majocchi. Treatment with orally terbinafine was successful.

Case for diagnosis.

Hidradenitis suppurativa is a chronic inflammation of the apocrine glands. It usually starts at or soon after puberty, and women are more often affected than men. The most affected sites are the axillae; however, other regions rich in apocrine glands may also be affected.

Case for diagnosis. Erythromelanosis follicularis faciei et colli.

Erythromelanosis follicularis faciei et colli is a rare disease of unknown etiology characterized by symmetric erythematous brownish hyperpigmentation on the frontal, malar and temporal areas associated with involvement of the pilary follicle. It is common to present pilar keratosis on the shoulders and neck. The three main clinical characteristics are: erythema (with or without telangiectasias), discrete follicular papules and brownish hyperpigmentation.