Abstract
Chlorhexidine (CHX) is a highly effective antiseptic agent. Allergic reactions on use of CHX are rare, but an increase in the percentage of cases is witnessed due to rapid increase in CHX-containing products in recent times. CHX forms an indispensable part of dentistry. The present case report showcases allergic reaction seen as a result of the use of CHX mouthwash, where in patient develops redness and inflammation on gingiva as well as urticarial rash on the skin of the back. The case report warns us for a cautious use of CHX products.