The pre-diabetic label is a wake up call along with your dis-satisfaction with your skin.The fact that you purchased a juicer shows a pro active move towards health and vitality.A cheap juicer can do wonders if used to its full potential.The skin is a pathway of elimination,over 50% of the bodies solid waste material comes out through the skin.Carrot juice has nutrients that the liver uses to cleans itself and then dumps the toxins into the bowels to be removed.If the bowels are moving well and have lots of good fiber to bind these toxins then they will be mainly pulled out through the bowels.If not they will come out through the skin which can cause all kinds of issues with the skin.Some people drink so much carrot juice that the toxins coming out turns them an orange hue.This might be what is happening with your skin but the only way to check would be to eat cucs and spinach and see if it happens again.Eating these foods reduces the cleansing effect that juicing has through concentrating the nutrients of the foods in question.They say raw green bean juice does wonders for the pancreas but I have never tried green bean juice and have no plans to try it.I do have pics. of the greens that I grow in the Image Gallery in the photos section under grassmans sprouts.Happy juicing and may spring come quickly.Jeff.