Erythema Adverse reaction to the Hepatitis B, Hepatitis A, Polio, MMR, DTaP, Polio, Varicella (chickenpox), Hib and Meningococcal vaccines according to the manufacturers. <dermatology> A name applied to redness of the skin produced by congestion of the capillaries, which may result from a variety of causes, the aetiology or a specific type of lesion often being indicated by a modifying term. (18 Nov 1997) Erythema multiforme lesions are circular and may appear in concentric rings (often called target lesions). Target lesions may also be associated with other medical conditions such as herpes infection, streptococcal infection, tuberculosis (TB), or as a reaction to chemicals or medications. Newborn infants may have Erythema toxicum, a rash that is characterized by patchy redness with central vesicles. The rash is temporary, and the location may move (transient). Search more on Erythema at www.nih.gov