No, not the ones under the ground, the ones on your skin!!
Having just had one cut from my leg, not as simple as you might think! I would like to draw your attention to this subject.

If you notice that a mole has grown, changed shape, is irregular, more than one shade of colour, has 'ragged' edges or is not symetrical, itches or bleeds you should seek prompt attention from your GP and get it checked out.

Be sun aware and never let your skin burn. Always protect your children from the sun as sun damage ( particularly burning ) in childhood is a strong risk factor in terms of developing skin cancer in later years. Unfortunately skin cancer is increasing in the population yet it is largely preventable and looking after your skin and keeping an eye on your moles will go a long way to avoid it.