The erythema and swelling can be explained at a cellular level by all except increased vasomotor tone (vasoconstriction) of the capillaries in the area. Erythema causes skin redness.
Erythema refers to skin redness due to injury and/or inflammation in a given region of the body.
Erythema may be due to different factors (e.g., environment, virus infection, sunburn, etc).
Conversely, vasoconstriction refers to constriction of the blood vessels, which is caused by their cells walls.
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