As long as you've had a mammogram to rule out any dangerous types of lumps, that could be a problem. Then you shouldn't have anything to worry about.
Now the Basic Female Breast Anatomy would conclude that the reddish part surrounding the nipple is called the areola. Areolas usually grow in size and get darker during pregnancy - as if making it easier for the baby to spot the place of nourishment.
The little 'bumps' on the areola are called Montgomery glands, and they produce oil that lubricates the nipple/areola complex.

Ref: http://www.imessenger.live/99/what-are-these-lumps-around-my-nipples?show=110#a110