Erythema is when skin gets red. This could be due to lots of things: rash, inflammation, injury or infection. Skin looks red because the capillaries in the skin are increasing blood flow in response to a stimulus. Increase in blood flow can bring more nutrients to the area, clear away debris, and bring extra immune factors to an infection.
Podiatrist, Neuropathy Doctor, Father of 11 and Founder of Mountain West Foot & Ankle Institute