• Erythema annulare centrifugum (EAC) is a figurate erythema that has been associated with many diverse entities. A case of EAC was related to infestation by the nematode, Ascaris lumbricoides. A careful examination of the patient did not define an immunologic basis for EAC. Results of lymphocyte stimulation tests of the patient showed an immune response to A lumbricoides extracts but not to A suum extracts. This finding is of practical importance, since most laboratories use A suum extracts in routine skin and serologic tests for human ascariasis.
(Arch Dermatol 1981;117:582-585)
Hendricks AA, Lu C, Elfenbein GJ, Hussain R. Erythema Annulare Centrifugum Associated With Ascariasis. Arch Dermatol. 1981;117(9):582-585. doi:10.1001/archderm.1981.01650090064030