Could be anything: A lump the appears in the breast "overnight" probably has been there before but was not felt or could be a cyst that just formed. A cyst would usually be tender to touch. If the lump persists beyond a few days, consultation with a breast specialist should be sought, a cyst might be treated with an aspiration in the office but a persistent mass requires a through evaluation and probable a biopsy.
Answered 5/30/2021
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