Close-up of an allergic skin reaction of a 77 year old male patient due to rivastigmine skin patches. Rivastigimine transdermal skin patches are placed on the skin to deliver the drug rivastigmine, an acetylcholinesterase inhibitor used for the treatment of mild to moderate Alzheimer's disease and Parkinson's disease. This allergic reaction is a contact dermatitis, a type of eczema caused either by a toxic reaction to some substance or by an allergic reaction.