Nevus oligemicus presents as a patch of livid skin that is cooler than the normal skin, as a result of decreased blood flow, in which vasoconstriction of deep vessels is thought to be the underlying defect.
[1] In terms of clinical manifestation, the lesions appear as cyanotic, fixed, erythematous-violaceous patches or, in certain situations, as whitish, telangiectatic plaques.
[4] The primary clinical feature is the continued presence of cold skin to the touch when there isn't any obvious vascular ischemia nearby.
[3] Obesity and inactive lifestyles have been identified as risk factors.
This leads to changes in adrenergic activity, an increase in sympathetic tone, and ultimately vasoconstriction and a slowdown of deep dermal vascular flow.