Allergies to toxins in our food or environment can happen at any time. All food has natural toxins and now synthetic toxins (i.e perservatives to extend shelf life, etc.) PLEASE please, first eliminate all wheat products from your diet. It is estimated 40 percent of the population is allergic to wheat, but does not know it. I have had mild to moderate eczema on my upper arms, chest and back for about the last 25 years due to wheat. By systematically removing foods from my diet, only recently I realized wheat was causing my skin problems. If eliminating wheat from your diet does not work to improve the rash; Next eliminate corn. All corn is considered a pesticide, because bugs will die when they eat corn. Today all corn is GMO. If bugs die when they eat corn, the corn is not good for you either. Next eliminate drinking milk products. Eat only foods that have less than five ingredients; i.e. steamed vegetables, greek yogurt, potatoes, almond mild, etc. see what works for you. Also disassociate from those step children!