The skin is the largest purifying organ of the body. When the liver is overwhelmed or is not functioning properly - the skin will take over and remove toxins. The face is one of the first places to show the signs of toxin removal.
I have known lots of cases of acne to be cleared up from a parasite cleanse. Another good treatment - if a person chooses to use it - is plain old-fashioned Pond's Cold Cream. Rub a thin layer on after washing the face and leave it on - the acids in it will kill surface bacteria and will help clear acne rapidly.