Not necessarily just nail psoriasis but paraffin wax baths may help. I would suggest reglar treatment of cuticle/ nail oul or cream. I use a combination of essential oils, & herbal salves/cream targetting dry skin or damaged skin. Off top of head, essential ouls that may help include Geranium lavender, cedarwood. Herbal ingredients that help include calendula, yarrow, jojoba oil, and comfrey