The side between the anus and the vagina grows a hard lump rubbed ointment became smaller, may be due to folliculitis, perianal abscess or tumor, it is recommended to consult a doctor in time for a clear diagnosis, can be followed up or appropriate treatment. 1. Folliculitis: local inflammation caused by bacterial infection of the hair follicle, usually with the pustule broken, the pus naturally flows out, can be self-healing, usually do not need additional treatment. 2. Perianal abscess: acute suppurative infection occurring in the soft tissues around the anal canal and rectum or in the peripheral space. The hard nodules become smaller does not mean that it has been well, may also need surgery to incise and drain, need further examination to clarify. 3. Tumor: it may be benign tumor such as lipoma, or malignant tumor or malignant metastatic tumor, which requires surgical resection or even radiotherapy. It is suggested that patients should seek medical treatment in time, and make clear diagnosis and treatment under the guidance of doctors to avoid delaying the condition.