DERMA-IONX is helpful for many skin conditions. It is an oral homeopathic product which stimulates the enzyme systems in the body that aid the skin and helps with assimilation of nutritional components in diet and supplements. What sets it apart from most homeopathics is that it is in an oligotherapeutic mineral base which has had a charge added to it.
Initially I would give a half dose of DERMA-IONX on the breakfast and supper food. After there are signs of improvement you can give a whole dose once a day. I would also give Probiotics to aid digestion. OMEGA 3,6,9 given orally is also helpful in soothing irritated skin and improves coat quality. The water you give should be filtered if it contains chlorine.
Diet can also influence the skin. Sometimes the flavor even makes a difference. I would choose a grain free fish or turkey food since these are considered to be cooling for irritated skin according to Chinese food therapy. Beef is neutral. Chicken, lamb, and venison are warming. If your dog is allergic to a protein do not use it even it has the correct thermal property.
Also use a flea comb to check for flea debris in the coat. Even one flea bite can start the allergy reaction. If you see any evidence of fleas you will need to get rid of them. DEFENDEX shampoo can help wash away debris and allergens.
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