Cold Sores & Fever Blisters is a homeopathic remedy for the relief of fever blisters and mouth ulcers (canker sores) due to colds or stress. Formerly Hyland's #27, 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. 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. Natural relief for cold sores, cracked lips and fever blisters due to common cold or exposure. Relief of symptoms of cold sores, cracked lips and fever blisters due to common cold or exposure. Also useful in canker sores and mouth ulcers due to acid foods.