Aloe vera is very soothing for eczema and psoriasis, however it may not be enough by itself, or in that combination with slippery elm.
I'm from Hopes Relief and would like to recommend our eczema and Psoriasis
cream with a 5 herbal active formula: Aloe vera, Gotu Kola, Licorice, Manuka Honey (UMF10+) and Calendula. There are also 3 homeopathic remedies included: Toxicodendron Radiican, Sulphur, and Graphites. The benefits of which I'm sure your Homeopathic Dr can explain to you.
Give it a try, you can get your money back if you're dissatisfied. http://www.hopesrelief.com.au