answered question 12/22/2008 I Have A Lump Under Both Of My Nipple One Is Smaller Than The Other. What Could It Be? I'm 12 Fit And Healthy I'm Scared If It's A Tumour Please Help I Am Also Male As far as I'm aware, these could be milk glands, both men and women lactate during puberty and this could be what you see, but I agree with Angel1234, get it checked out!