Third nipple?

[Miss E]

Just wondering if anyone knows what a third nipple looks like? I have developed this little lump under my left breast which I am begining to think may be a third nipple.

It first popped up when I was about 6 wks preg and at first I thought it was a pimple. I've always had something there, but for some reason remember it being more like a chicken pox scar. Anyway, once I got preg it has gotten bigger and for a little while there it was a bit irritated from my bra rubbing against it. It's settled down now, but I'm not sure what it is.

I meant to ask my GP about it last time I went to see her, but forgot. Anyway, I was looking at it last night and wondering could it be a third nipple? It looks like a cross between a pimple and a wart (but much softer) but is slightly darker...