I'd have red palm or rash/itchy palms very less in the past. But I used to have rash/itchyness on the body almost every second day and had to take an avil almost every other day.
But since past 2-3 months ago, it has stopped. It continued for a long years but it stopped suddenly. I think maybe the quality of life by having lower ferritin, taking good antioxidants (I believe this maybe very reason as I started on a lot of quality antioxidants since past 4-5 months) and keep the health good in general by eating healthy helps.
Also, in CBC, check your "Eosinophills" (I may have spelled it wrong) count. A high count also causes reaction/rashes as advised by my physician. He may prescribe you a medicine to lower it if it's high and then see if it helps.
Also being acidic in nature (pH acidic) I think that also causes many reaction. So detox your body, take a lot of antioxidants like L-carnitine, IP6 (if possible) and few other general stuff and it will help.
-P.