Below are the main rubriks (i.e strongest indications or symptoms) of Kali Arsenicosum in traditional homeopathic usage, not approved by the FDA.
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BACK AND NECK
Back and neck
sore, bruised, beaten
dorsal (shoulder level); shoulder blades
lumbar (lower half of back)
sacrum (base of spine)
out-breaks on skin; patches
out-breaks on skin; psoriasis (red patches with silvery scales), patches
Stiffness≡ more ...