Itchy left boob with pic

My left boob under nipple is itching to the point im nearly in tears as its itching inside my skin and i can't get to it, any help or remedies pls im in for…

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Spot/sore on boob and itchy nipple (pic included)

Weird rash appeared under my left breast. Skin around the area seems sensitive, but isn't red. Feel the same on my back too, but no rash there. Any idea what it is??