We have a grandbaby who developed eczema and through trial and error have discovered that the root cause of the eczema is due to a problem with his digestive and immune system. We have discovered that he cannot tolerate any dairy, sugar or soy products. Putting on cream is only a band-aid. We've read so much concerning eczema and are seriously thinking that antibiotics and vaccines might be one reason so many people now suffer from this awful skin condition. Your son might do better if he were to discover what foods triggered his eczema.
Hope this helps. Good luck with it.