I can't believe im readking the above about in general food not causing external skin symptoms...is this a joke.  Of course they do, sure you will have heard of the typical internal reactions like coughing, difficulty breathing etc but there are the more common external reactions like hives, itching, mouth and face swelling from food.  I suffer from allergies to food ie sugar and mayonnaise make me break out in hives, so do seafood (more hives accompanied by vomiting and fever).  My friend's lips swell and she gets an itchy throat from eating prawns.  My father consumed a crap load of mangoes when he was younger and suddenly developed an allergy to them, the mango sap makes his skin swell in blisters and the smell makes him ill not to mention the mango flesh and juice itself.   I would forget seeing a doctor avoid these foods completely esp seeing Splenda is bad for your health to begin with and if at all eat very little refined foods and focus on making fruits and fresh raw and cooked veg a big part of your diet, it's helped me immensley.