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However the sudden network patterned cutaneous discoloration is completely innocuous with mild episodes of ulceration on the breasts abdomen buttocks and thigh caused by heat. The discoloration is caused by reduction in blood flow through the arterioles that supply the cutaneous capillaries resulting in deoxygenated blood showing as blue discoloration.

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Idiopathic livedo reticularis unsteady flow of blood through the veins particularly in young females could occur for unknown reasons.

Lace pattern rash. The discoloration is affected by the blood vessels closest to the top layer of skin so individuals with translucent skin pigmentation will notice changes right away. Livedo reticularis is a common skin finding consisting of a mottled reticulated vascular pattern that appears as a lace like purplish discoloration of the skin. The most obvious symptom of mottled skin is the pattern of purplish blue lines imitating lace with defined borders.

Livedo reticularis is a vascular rash that can occur anywhere on the body but commonly appears on the legs arms and trunk. This type of rash can be seen in a disease called erythema infectiosum which is caused by a virus called parvovirus b19. Lupus may also cause mottled skin.

The most recognizable of these is a butterfly shaped rash on the face. It is caused when there is constriction or narrowing of small blood vessels in the surface layers of the skin creating a mottled lace like rash. It will spread and then merge to form a blotchy lacy pattern across the body.

At first this rash is red and slightly raised. Lupus is linked to sensitivity to sunlight which may cause skin rashes.