Just wanted to post an update, sorry for the delay, between company for the holidays and illness, I haven't had much time to get on the computer.
I made him the lard/OO/castor recipe Susie posted, HP'd, no KOH or scent/color. Also made a 1lb batch of castile, but I haven't given that to mom yet.
I didn't know when I posted before, but mom got the idea for CO-free soap from the allergist. Apparently he's a bit of a "crunchy" guy and also likes trying alternative stuff, but mom didn't know anyone to make soap until it came up in conversation with me a few weeks back.
I did NOT make him a salve, and I didn't use any herbs/infusions in the soap. Mom told me last night his hands are MUCH better now, they aren't cracked or itching and she said that is unheard of this time of year. I think I took her the soap on Dec. 23rd.
I really appreciate everyone's thoughts and guidance about oils to avoid for this. I've tried to write my thoughts several times about allergies in general, but they sound argumentative and that isn't what I intend, so....I'll just say I really appreciate everyone sharing their perspective and experiences, it all was very useful and helped me make a decision I was comfortable with.