I am a 30 years old female with two kids, 4 years old child and 8 month old breastfeeding baby. All of a sudden there is extreme heaviness in my right breast, it almost feels like stone with lot of lumps. I fed my baby and still it is the same since almost 4 hours. There also seems to be a small boil sort of thing on my right nipple. There is also slight pain in the right breast. What could be the reason for this? How do I cure this?