Final answer:
Erythema is the general term used to describe redness of the skin. It is the result of blood vessel dilation and often seen in conditions like cellulitis and erythema nodosum.
Step-by-step explanation:
The general term used to describe redness of the skin is erythema. Erythema is the result of dilation of blood vessels in the area, which helps bring in white blood cells to fight inflammation. It is commonly seen in conditions like cellulitis, erysipelas, and erythema nodosum.