In a case of allergic dermatitis in a palm, the allergens need to be avoided and (if related to work) work needs to be changed as the priority.

I learned the hard way about using unfamiliar lotions, I experience contact dermatitis in all the places I put the lotion. The lotion was old, I believe it separated and the thinner oils came to the surface, whatever I reacted to was concentrated on the top.

I'm still recovering, I have learned a powerful lesson.