Erythema is a medical term that refers to redness or a rash on the skin. It occurs when the blood vessels near the skin's surface become irritated or expanded, leading to a reddish appearance. Full definition
The guidelines cover three common issues faced by clinicians: management of a known tick bite, antibiotic treatment of patients with erythema migrans rash, and management of patients who remain ill following antibiotic therapy for Lyme disease. (lymedisease.org)
Sometimes a paw condition also indicates a health condition such as erythema multiforme. (dogs.lovetoknow.com)