Carrots make a very good skin mask for acne and blemishes.

Apply raw, grated carrots to the face while lying down, a little lemon juice may also be added.
For a cooked carrot mask: Boil three large carrots and mash them, or process in a food processor. Add 5 tablespoons of honey or yogurt (optional).
Apply gently, in an upward motion. Leave on for 15-20 minutes. Rinse with warm water.
Finish with a final rinse of witch hazel.