If you have a clogged pore though you should make sure you're not developing mastitis. My aunt had it and thought that she was getting the flu. The symptoms are :
Breast tenderness or warmth to the touch
General malaise or feeling ill
Swelling of the breast
Pain or a burning sensation continuously or while breast-feeding
Skin redness, often in a wedge-shaped pattern
Fever of 101 F (38.3 C) or greater
She eventually had to go to the ER to have it lanced because she let it go. They said it probably started as a plugged duct and got worse.
KellyMom- Plugged Ducts and Mastitis