Hi, thanks for writing to HCM and sharing your health concerns regarding a mobile small breast nodule! Well, If I were your treating physician for this case of a breast lump which is mobile, small and painless, I would come up with four possibilities, these include: 1. fibroadenoma; benign and not to worry; possibility 85% 2. The second possibility is of benign and simple conditions like lipoma or fibroadenosis; there is nothing to worry about these! possibility 5% 3. The last possibility is of a simple cyst or some other benign cysts ! Nothing to worry about these also! possibility 5% 4. malignancy; in some cases cancer could also be mobile; possibility 5% Therefore, the treatment only depends upon the diagnosis and generally minor surgeries are sufficient in majority of cases! I suggest you to go for an FNAC /biopsy and ultrasound of the lump for confirmation and to relieve your concerns! Hope this answers your question. If you have additional questions or follow up questions then please do not hesitate in writing to us. I will be happy to answer your questions. Wishing you good health.