Health Advice On Lump In Stomach

I'm not Dr so have no idea if this points to something serious or not but I'm hoping some health knowledgeable people here can help me out.

Tonight I suddenly noticed this pinkish lump in my belly button.

Picture below.

What would you say is the cause? 

It's not painful at the moment, just looks unsightly. No blood or pus. I do occasionally get nauseous and swollen stomach but have been diagnosed with IBS so I'm thinking it's to do with that rather than this lump.

I'm sure the lump wasn't there the 2 days ago.

Do you think it could be cancer related? It runs in my family and I have been very tired and a little dizzy lately.

Your thoughts on this and how serious it might be would be greatly appreciated.

Thanks in Advance!

The picture:

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