Potato is effective in treating any kind of discoloration of skin. Its excellent cosmetic properties make it very useful in fading acne and pimples scars. Grate a raw potato to take out juice and apply it on acne scars. Potatoes work wonders on clearing pimple marks. Just rub a slice of raw potato or apply the juice of raw potatoes on your acne marks to get clear skin. Potato lightens the marks due to its bleaching properties.