Hi I am a 55 year old male; for about 4 weeks now (may be longer, but only really noticed it about a month ago), I have had a small, white "whitehead like" raised spot on my left nipple. I tried to gently "pop" it. but it wouldn't, so have left it alone , but it doesn't seem to want to go. I have had blocked sebacious glands on my back before, could this be similar? It only hurts if I catch it and there does not seem to be any lumps in the breast are. Should I be concerned? Thanks Phil