Treating cold sores. Cold sore blisters usually heal in a week by themselves. Over-the-counter topical anesthetics can p治疗唇疱疹。唇疱疹水泡通常在一星期自然愈合。非处方的局部麻醉能减轻疼痛。处方抗病毒药物能减少这些病毒的感染。