My 7 year old son's left nipple area has been slightly swollen for the past 2 weeks. Tonight he told me that his heart hurts right under where his nipple is. His nipple is still slightly swollen, but today it looked worse. When I touched it, I felt a lump about the size of a small pea under the skin. The fact that this issue first surfaced two weeks ago and seems to be getting worse has me concerned. Today he has been running a fever with the cold sweats off and on - but also has belly ache - don't know if its all connected or not....I see different sites talking about this happening in boys at the onset of puberty . . .but he is only 7. Any ideas? Should I rush him to his pediatrician? Thank you.