Swollen areolas can occur for various reasons, including hormonal changes during the menstrual cycle. It's not uncommon for some women to experience changes in breast tissue, including the areolas, in response to hormonal fluctuations throughout their menstrual cycle.
Do you have any associated ulceration or discharge from nipple ?
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It’s unlikely to be anything cancerous since it’s on and off. But need full history to give you conclusive answer.