Have you tried a warm compress? I did this every few hours for a couple days and it really helped. Hand expressing / massaging right after might help too.
What @Tricia said! Exactly what my doctor had me do
Sunflower lecithin is amazing. Gentle hand compression in warm bath or shower, cabbage leaves (proven by science my dude it works lol), check for thrush maybe if it’s more in the nipple area
Try taking a hot shower and massaging it and hand expressing under the water that helps me
Could be a clogged duct Or mastitis