Remescar Herpatch Serumis the innovative and effective way to easily and quickly treat cold sore symptoms. Herpatch Serum is easily applied to the blister with its easy-to-use tube. After a few minutes, the white serum forms a transparent protective layer on top of the blister and, together with the active properties, helps accelerate the healing process. Herpatch Serum treats cold sore symptoms in all phases of the outbreak.