a painful area on the body that has liquid (called pus) coming out of it 化脓处；脓疮 a neglected animal covered in running sores 被跑伤覆盖的被忽视的动物 - (figurative)
Mining and the condition of miners has been a running sore (= a serious continuous problem) in the country for many years. 多年来，采矿和矿工的状况一直困扰着该国（严重的持续性问题）。