Below are the main rubriks (i.e strongest indications or symptoms) of Mercurius Corrosivus in traditional homeopathic usage, not approved by the FDA.
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BACK AND NECK
Back and neck
Pains in head, back, and limbs; kidneys affected.
Pott's disease; lies on back with legs drawn up.
Tonic cramps; tension in l. scapula; tearing. 21. Limbs.
Coldness in extremities, they look purple, with small, spasmodic, frequent pulse.
Rheumatic pains after gonorrhoea suppressed by Copaiva.
Paralysis in all limbs; trembling.
Glands of neck hard and swollen.≡ more ...