Quotation from: Manual of Surgery

Written by: Alexander Miles and Alexis Thomson


_Redness_, similarly, is due to the increased afflux of blood to the
inflamed part. The shade of colour varies with the stage of the
inflammation, being lighter and brighter in the early, hyperaemic stages,
and darker and duskier when the blood flow is slowed or when stasis has
occurred and the oxygenation of the blood is defective. In the
thrombotic stage the part may assume a purplish hue.


The _swelling_ is partly due to the increased amount of blood in the
affected part and to the accumulation of leucocytes and proliferated
tissue cells, but chiefly to the exudate in the connective
tissue--_inflammatory oedema_. The more open the structure of the tissue
of the part, the greater is the amount of swelling--witness the marked
degree of oedema that occurs in such parts as the scrotum or the eyelids.

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