Cinnamic aldehyde allergy.

Positive patch test reactions to 2 % cinnamic aldehyde were obtained from 2.8 % of 34 males and 9.1 % of 55 females. The 9.1 % female reactivity may be traceable to perfumed cosmetics. Simultaneous Jasmin allergy is documented us is the occurrence of alpha-amyl cinnamic aldehyde in synthetic, Jasmin. The relevance of these reactions is discussed. In two of the patients a proper diagnosis was not made from the original contact history. Only after a screening tray demonstration of cinnamic aldehyde allergy could a relevant history be taken from these patients.