The authors report a case of acute eyelid dermatitis, arised during the wintertime, and showing symmetric purpuric erythema of both eyelids along with a moderate infiltration and minimal fine scaling. Clinical history and data highlighted that this dermatitis could be related to the contact with the rubber additives contained in a hot-water bottle. In fact, patch test revealed a sensitization to mercaptobenzothiazole (MBT) and MBT mix.For this reason, the use of hot water bottle was forbidden to the patient and the dermatitis rapidly ended up. The aim was our study is to investigate carefully the cause of dermatitis that is often hidden.