The area of my right nipples is swelling but not too much but hurts when you touch it. what is this? im only 16 years old boy.

Normal: Part of pubertal changes in boys, usually one or even both nipples swell a little and become tender, will go away on its own shortly

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.