There are mainly three possibilities here:
Enlarged or infected Montgomery tubercles: Montgomery's tubercles are normal glands which are present in the areola in both men and women. Sometimes they may get infected or inflammed.
Ingrown hairs: Small hair follicles are present in the periphery of the areola. These can form ingrown hairs which can form bumps.
Hidradenitis suppurativa: this is a condition where the sweat glands present in the areola become blocked leading to inflammation and soreness.
From your description, infected Montgomery tubercules is the most likely for you.
You should see a doctor for this. Mild cases can be treated by keeping the area clean, preventing friction. In more severe cases, topical antibiotics, oral antibiotics, steroids, pain killers, are prescribed.
Your doctor will be able to prescribe this for you.
You have to see the doctor for this as all changes in the breast and areola need to be seen by a doctor at the earliest to rule out more severe conditions.
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