In this case, it is generally considered a benign lump, possibly a fibrous tumor, because for this kind of small lump felt in the breast, and the mobility is very good, generally are more benign tumors. Because benign tumors, according to the way it grows, is a swelling growth; if it is a malignant tumor, is an infiltrative growth. So the swelling growth of the tumor, the activity is better, this situation should be benign. Of course, we should go to the hospital to do an ultrasound examination, if the diagnosis is a hypoechoic nodule there, it is best to surgically resect it and take it to do pathological examination to determine whether it is benign or malignant. Generally benign tumors are mostly fibroadenomas. Benign tumors are usually fibroadenomas. If it is malignant, it depends on which type it is, and then further surgery, or chemotherapy, or radiotherapy, etc. will be done.