Pigmented purpuric dermatoses: analysis of epidemiological, clinical and histopathological aspects in relation to the prognosis of 70 patients, including infants and adults

Pigmented purpuric dermatoses (PPDs) are a group of chronic-relapsing, inflammatory purpuras without vasculitis that typically involve the lower limbs. Five major types could be distinguished, according to the clinical and histopathologic analysis. The etiopathogenesis is still unknown and multiple factors have been considered. Prognosis seems not to be influenced by the different clinical forms of PPDs; nevertheless no previous studies have investigated whether it could be influenced by the anatomical distribution of the disease.