Erythema and Hives

Erythema noun - Abnormal redness of the skin resulting from dilation of blood vessels (as in sunburn or inflammation).

Hives and erythema are semantically related. In some cases you can use "Hives" instead a noun "Erythema".

Hives noun - An itchy skin eruption characterized by weals with pale interiors and well-defined red margins; usually the result of an allergic response to insect bites or food or drugs.

Erythema and hives are semantically related. You can use "Erythema" instead a noun "Hives".