Immediate and delayed photocontact dermatitis from isopropyl dibenzoylmethane.

Immediate and delayed photocontact dermatitis from the UVA absorber isopropyl dibenzoylmethane is described in 1 patient. In a dose response study in a 2nd patient with delayed photocontact dermatitis, the minimal dose of UVA needed to elicit a positive photopatch to isopropyl dibenzoylmethane 2% was determined to be 2 J/cm2.