Boils are local lesions formed by infection of skin follicles. The following are the main common clinical causes of hardness underneath boils: a. When serious infection occurs in local soft tissues, it can be manifested as hard texture. The size and scope of inflammatory lesions can be clarified by ultrasound examination, and external application of Ruyi Jinhuang cream and vital iodine gauze can promote faster absorption of local inflammatory lesions. If there is local abscess, it is necessary to perform abscess incision and drainage as soon as possible under local anesthesia to remove local necrotic tissue, thus relieving the harder state under the boil. Second, boils with inflammation often have abnormal proliferation of fibrous tissues in the process of self-repair, which manifests as local hard masses. At this time, you can improve local blood circulation by applying topical Ruyi Jinhuang cream, infrared irradiation physiotherapy, and blood activation and stasis removal cream to promote faster absorption of the mass under the boil, and most patients can achieve better treatment results.