Dermoscopic Findings in Patients with Pigmented Purpuric Dermatoses.

Pigmented purpuric dermatoses (PPD) are a group of chronic and relapsing cutaneous disorders characterized by a distinct purpuric rash. The diagnosis is made with clinical and histopathological findings. Dermoscopy has rarely been used in the diagnosis of PPD. The aim of our study is to describe the dermoscopic findings in patients with PPD. Eighteen patients who were clinically and histopathologically diagnosed with PPD were studied prospectively. The type and duration of PPD, associated diseases, and medication history of the patients were noted. Dermoscopic examination was performed in all of the patients. Four of the patients were women and 14 of them were men. 16 (88.8%) of them had Shamberg's disease, 1 of them had lichen aureus, and 1 had purpura annularis telangiectoides. Dermoscopic examination revealed multiple irregular red dots, globules and/or patches and brown-coppery coloration on the background in all of the patients, a network of interconnected brown lines in 8, linear vessels in 9, brown dots in 3, grey dots in 3, twisted red loops in 5, comma-like vessels in 2, and red lacunae in 1 patient. The dermoscopic examination of PPD might improve the accuracy of clinical diagnosis.