Condition	Characteristics
Acrocyanosis	Persistent, cyanotic or erythrocyanotic, mottled discoloration; most common on the hands, but also occurs on the feet and face; more common in the winter
Erythema ab igne	Localized, net-like, erythematous, and hyperpigmented skin lesions due to prolonged thermal radiation exposure (e.g., with use of a hot water bottle or heating pad)
Erythrocyanosis	Persistent, dusky erythema occurring at sites with a thick layer of underlying subcutaneous fat, such as the thighs and lower legs; more common in the winter
Livedo reticularis	Reticular reddish-violet discoloration of the skin that typically affects the limbs, although it can be generalized; more common in the winter