Stage makeup should always be designed according to the size of a theater and its audience, with smaller theaters needing more subtle makeup and larger theaters needing more dramatic makeup. In the case of moles, this means making them smaller or larger.
Choose a brown eyebrow pencil. If you are not making any makeup changes to the actor's natural coloration, choose a pencil of a shade that matches her own moles. If you are making changes (such as darker or lighter hair) choose an appropriately darker or lighter color pencil to correspond, and bear in mind that you will have to darken the actor's natural moles to match (or conceal them).
Sharpen the pencil. Try to create the largest possible tip of exposed makeup core.
Dull the tip of the pencil. For best results, the tip of your pencil should correspond to the size of the mole you want to create. Dull the tip by pressing and rubbing it gently with your fingertip.
Choose a position for the mole. This may be dictated by the play itself (if it is referenced in the script); otherwise, choose a position based on aesthetics (or lack thereof if the character is meant to be ugly). Choose also based on the action of the play and whether a certain position may put the makeup at risk of being smeared; for example, if the character ever wears a hat, avoid a forehead or temple mole.
Create the mole. Press the tip of the pencil against the actor's skin and turn it a few times. This will create a mark that is mostly round but not perfectly, like a natural mole.
Powder the mole. Lightly dusting the mole, as well as any other makeup, with translucent powder will help prevent smudging or smearing from contact or sweat.
Photograph the actor's face. You will want to be able to re-create the position, shape and size of the mole accurately from night to night ,and you will need a photo in order to do this. This is especially important if your production is being photographed or videotaped on more than one night.