What Causes Development Of Moles All Over The Body?

Hi all

I'm a 29 year old healthy male however something slightly strange is happening to my skin. I've noticed over the last couple of months a fairly rapid increase in the number of moles I have! I should point out that they are not large cancerous looking ones but I am slightly concerned at the number of new ones. Basically they're just small typical looking moles but they are appearing all over. I don't spend much time in the sun and don't use sunbeds. Anyone got any ideas?

Thanks