Hydrocolloid wound dressings have been in use for nearly two decades, and have rarely caused allergic contact dermatitis. Duoderm CGF is a new version of Duoderm that contain the pentaerythritol ester of hydrogenated rosin as a tackifying agent. However, the allergic contact dermatitis to Duoderm CGF has not been reported in Korean dermatologic literature. We report a case of allergic contact dermatitis in a 36-year-old female during management of leg ulcer using Duoderm CGF