skin (rare) Skin ulcers   Skin ulcers (rare) Medical Source Information Yellow highlights indicate symptoms related to blistering rash. Hypersensitivity reactions to chlorhexidine have included allergic contact dermatitis , pruritus , vesicle formation, urticaria , dyspnea , and anaphylactic shock . Hypersensitivity reactions have been reported after the use of products containing chlorhexidine