Two cases of contact dermatitis caused by calcipotriol cream.

Two patients with psoriasis were treated with calcipotriol cream, and both developed contact dermatitis. Patch test results were positive to calcipotriol and negative to the ingredients of the vehicle in both cases. The first case may be explained by a compound allergy or by a false-negative reaction to calcipotriol due to the very low concentration used for patch tests. The second patient was clearly positive to calcipotriol despite low concentration. This is the first case reported thus far with sensitivity to calcipotriol at a concentration < 2 mc/mL, as recommended in other studies.