The fact that acute mastitis patients don’t have a fever, but have hard lumps is a sign of mastitis, because the patient’s fever doesn’t mean that the inflammation has completely subsided, hard lumps belong to the inflammatory lumps of mastitis, milk stagnation, or mammary abscess, which need to be further given physical therapy, medication, or even surgical treatment. 1. Inflammatory lumps: Mastitis patients suffer from bacterial infections, local tissues are congested and edematous, which can manifest as painful lumps when touched externally. Although the patient’s fever has subsided, the inflammation has not been completely absorbed, so there are still hard lumps to touch. 2. Milk stasis: In lactating mastitis patients, milk stasis is one of the factors in the development of mastitis. When the patient’s fever goes down, if the milk ducts are still blocked, the milk stasis can also be hard to touch. 3. Breast abscess: Acute mastitis can be localized to form a breast abscess, and the patient may have a generalized fever. If given antipyretic medication, the patient’s fever may subside, but the abscess still exists, and the localized hard lump will still exist. It is recommended that the patient consult a doctor in a timely manner, complete the auxiliary examination, in order to clarify the condition of the patient, and the professional physician to give further treatment for the condition of the patient.