Quiz: Remember the definition of mal de mer?
erythema infectiosum erythema in·fec·ti·o·sum (ĭn-fěk'shē-ō'səm)
A mild infectious disease occurring mainly in early childhood, marked by a rosy-red maculopapular rash on the cheeks, often spreading to the trunk and limbs. Fever and arthritis may also be present. Also called fifth disease.