We understand the pain of cold sores and fever blisters � inside and out. You�ve probably tried many medicines to help with the healing and discomfort. Hyland's Cold Sores / Fever Blisters relieves the painful symptoms of unsightly cold sores.* They also work on cracked lips, as well as canker and mouth sores made worse by acidic foods. They�re safe for adults and children and can be used in conjunction with other medications. * The uses for our products are based on traditional homeopathic practice. They have not been reviewed by the Food and Drug Administration.