According to the symptoms you describe (severe breast itching, “bruise” with a small central lump on L breast underside, absence of pain and fluid coming out of the left nipple), it seems you might be experiencing a kind of breast tumor with an unknown origin. However, nothing could be presumed without seeing it. A prompt visit to your family doctor would be a most advisable next step. Your family physician might want to refer you to a thoracic surgeon, who, most likely, will do a physical examination, mammography, (ultrasound, if needed) and a lump biopsy, if necessary.
These few diagnostic tests will prove the nature of your condition and direct you to a proper treatment. Moreover, whenever there is a breast condition in question, smoke cessation is highly recommendable. (Comment: this question seemed quite unfinished, which might lead to an inadequate or incomplete answer).
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