Around of my right nipple is swelling but not to much and hurts a bit. im 16 years old?

Hormones?: Pubertal gynecomastia will occur in 1/3 to 1/2 of males ; can be one or both sides,generally last about a year before fading.Intensity varies from small lump to generous boobs.Overweight kids can appear to have it from just fat accumulation.If present after 3 years, surgical removal of the glandular tissue ; liposuction of any associated fatty tissue will do the job.