Pea-sized lump inside the breast near the surface under areola incision, 8 months post-op. Is this normal? Should I be worried?

I just noticed a pea-sized lump inside the breast near the surface under the areola incision. This lump is close to the surface approx <1 centimeter under the nipple line. It is slightly painful (hard to tell as I tend to manifest pain if I worry.) I have no other symptoms. I am about 8 months post-op. I had 400cc Mentor Silicone sub-muscular with a areola incision. As it happen I have a lady doc check up in less then a week. Should this be something of great concern, or is this a normal occurrence?