Hyland's Cold Sores and Fever Blisters is a traditional homeopathic formula for the relief of symptoms of cold sores and fever blisters due to cold or exposure. Working without contraindications or side effects, Hyland's Cold Sores and Fever Blisters stimulates your body's natural healing response to relieve symptoms. Hyland's Cold Sores and Fever Blisters is safe for adults and children and can be used in conjunction with other medications.