Ischaemia and cellulitis

In the neuroischaemic foot it may be difficult to differentiate between the erythema of cellulitis and the redness of ischaemia. It is helpful to elevate the leg. The redness of ischaemia is usually cold and is most marked on dependency: it will disappear upon elevation of the limb, whereas cellulitis will remain. The erythema associated with inflammation is warm, although a very ischaemic foot may become deceptively warm when it is infected.

Erythema also occurs secondary to traumas, including insect stings, where it is associated with histamine release.

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