Hello,
There are many causes of palm rash which include contact dermatitis, pompholyx or
dyshidrotic eczema, hyperkeratotic
eczema, lichen nitidus, hands, foot and mouth disease, nodular fibromatosis, tinea nigra palms, erythema multiforme and psoriasis etc. For confirmation of diagnosis, examination from a dermatologist and a biopsy skin are needed. Treatment is diagnosis specific and different for each.