I've got a couple of questions regarding moles. Would appreciate if someone can provide more info or send me in the right direction to read about this.

Does anyone know what SNPs are most important in determining the expected quantity of moles on the body?
Are they related to those that predict the amount of freckles?
Also are red moles caused by excessive exposure to the sun, or are they just normal moles that are simply coloured differently?
Does the quantity of moles increase with age?