In recent years there is a trend towards natural ingredients in cosmet
ics, e,g. propolis. We report two cases of patients with allergic cont
act dermatitis to propolis, Cera flava and Unguentum leniens. These co
ntact allergies are probably the result of residues of propolis in Cer
a flava. Unguentum leniens as a Cera-flava-containing agent must be co
nsidered a possible contact allergen in patients with propolis allergy
.