I need some reassurance this will be ok or us more likely to ok then not. My son 12 has had a lump behind one nipple since about October. We are going back to GP for review and maybe referral if they think it warrants it. I'm trying to google puberty/ nipple lump and not just nipple lump - all roads lead to horrible stuff on Google. I think it's likely puberty related as he's developed and grown a lot recently. But I'm scared. Anyone else had this?