Slight swelling and itching on the areola while breastfeeding is often due to skin irritation, a mild latch issue, or occasionally a yeast infection, and the photo doesn't show anything alarming.
Next Steps
Please keep the area clean and dry between feeds, and see a gynaecologist or lactation consultant if it doesn't settle in a few days.
Health Tips
If you notice cracking, discharge, fever, or worsening pain, please get it checked in person soon.