Capillaritis is where the
capillaries
A capillary is a small blood vessel from 5 to 10 micrometres (μm) in diameter. Capillaries are composed of only the tunica intima, consisting of a thin wall of simple squamous endothelial cells. They are the smallest blood vessels in the body: ...
, usually of the legs or lungs, are inflamed,
allowing blood cells to pass through.
It may occur in the
lungs as pulmonary capillaritis,
or in the
skin
Skin is the layer of usually soft, flexible outer tissue covering the body of a vertebrate animal, with three main functions: protection, regulation, and sensation.
Other animal coverings, such as the arthropod exoskeleton, have different de ...
as
pigmented purpuric dermatosis. Capillaritis usually affects otherwise healthy people.
Capillaritis can take many forms but is made up of tiny red or brown dots that may be spread out or in a group forming a red or brown patch on the skin. One variation, Majocchi purpura, forms concentric rings.
Capillaritis is a mild condition not requiring treatment. There is no known cure, however capillaritis can disappear within a few weeks, recur from time to time, or persist for years.
References
{{Cutaneous vasculitis
Vascular diseases