A hard lump next to the anus is more serious and may be due to diseases such as hemorrhoids, perianal abscess or localized cellulitis. 1. Hemorrhoids: Hard lumps at the anus may be due to external hemorrhoids. When blood pooling occurs in external hemorrhoids, it can lead to thrombosed external hemorrhoids. At this time, hemorrhoids can be prolapsed next to the anus, and the hard texture, the patient can feel severe pain, and even accompanied by blood in the stool, the need for surgical excision. 2. Perianal abscess: when the anal glands are blocked to form an infection, there will be perianal abscess, forming a localized hard lump, the patient may feel pain, swelling, and in severe cases, fever and other systemic symptoms. The patient may feel pain, swelling, and in severe cases, fever and other systemic symptoms may occur. Surgical incision and drainage is required. 3. Localized cellulitis: when the patient has localized trauma or infection, localized cellulitis can occur. With the progress of the disease, the hard lumps can gradually soften and form abscesses. Before it softens, it can be treated with drugs such as metronidazole ointment, and if an abscess has formed, it needs to be incised and drained surgically. If the above symptoms occur, it is recommended that the patient consult a doctor in time to determine what kind of disease is caused by a professional doctor, and targeted treatment to avoid delays in the condition.