Psoriatic arthritis in patients with psoriasis: A clinical-epidemiological study at a dermatology center in western Mexico.

Background/objective: Psoriatic arthritis (PsA) is a chronic inflammatory illness. Approximately, 15% of psoriasis patients have undiagnosed PsA. In Mexico, we found no related studies.

Eccrine porocarcinoma: epidemiologic and histopathologic characteristics.

Background: Porocarcinoma is a rare tumor, representing 0.005% of all malignant epithelial neoplasms. The majority of publications are single case reports.