Capillaritis is a medical condition characterized by inflammation of the capillaries. This condition can present as red or purple spots on the skin, which are sometimes itchy and painful. Other synonyms for capillaritis include pigmented purpuric dermatosis, purpura simplex, and progressive pigmentary dermatosis. Pigmented purpuric dermatosis is a term that refers to a group of skin conditions characterized by the presence of purplish-red discoloration on the skin. Purpura simplex, on the other hand, is a term used to describe a skin condition caused by fragile blood vessels that leak into the skin. Finally, progressive pigmentary dermatosis is a term used to describe a skin condition characterized by red or brown patches that may develop into larger patches over time.