Allergic contact dermatitis to cinchocaine.
A case of allergic contact dermatitis to cinchocaine is presented to highlight the confusion regarding the classification of, and cross-reactivity between, topical anaesthetic agents and the inadequacy of the use of benzocaine as a single screening agent for topical anaesthetic contact allergy. Our patient presented with a 10-day history of acute perianal dermatitis. Allergic contact dermatitis to Proctosedyl ointment, which was applied for 3 weeks prior, was suspected. On patch testing, he reacted to cinchocaine, a constituent of Proctosedyl ointment, and to the actual product, but had no reaction to benzocaine or lignocaine.
Kearney
C R
CR
Skin and Cancer Foundation, Melbourne, Victoria, Australia. chriskearney@hotmail.com
Fewings
J
J
D000287:Administration, Topical; D000368:Aged; D000779:Anesthetics, Local / Q000008:administration & dosage / Q000009:adverse effects*; D003992:Dibucaine / Q000008:administration & dosage / Q000009:adverse effects*; D003875:Drug Eruptions / Q000175:diagnosis / Q000209:etiology*; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D010328:Patch Tests; D018570:Risk Assessment
D000779:Anesthetics, Local; D003992:Dibucaine