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Why do I have one large breast which aches and sore nipples?

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For the last month and half I have noticed that my right breast has become much larger than the left one, at least a cup size and maybe more. When knocked it aches and throbs from time to time. This has become very uncomfrotable for me as I hate getting changed in front of people and hurts when I lay on them. Also, my nipples are very tender and sore to touch, does anyone know the reasons for this? Much appreciated!