Below are the main rubriks (i.e strongest indications or symptoms) of Nitric Acid in traditional homeopathic usage, not approved by the FDA.
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Has a particular affinity for mucous outlets, where skin and membranes join; cracks; rhagades fissures.
Pricking pains as of a splinter in the parts.
Urine strong smelling; like horse urine.
Haemorrhages from all outlets of the body; blood bright red.
Pricking ulcers; excrescences; condylomata; figwarts (sycosis).
Nervous, irritable, dark complexioned persons.
Modalities better riding in carriage.
If Merc Viv Mercurius has already been used without avail Nitric acid follows well and will often cure.
The anus is cracked and fissured similarly (Ratanhia Ratanhia), and haemorrhoids protrude, crack, bleed and are very sore. No remedy has more decided action upon the anus, and one very characteristic symptom is, "great pain after passage of stool, even soft stool." He walks the floor in agony of pain for an hour or two after a stool (Ratanhia Ratanhia). In dysentery this symptom distinguishes Nitricum Acidum from Nux Vomica Nux vomica, which is relieved after stool and Merc Viv Mercurius, which has tenesmus all the time, or before, during and after stool.
Benzoic Acid. Benzoic acid, urine is very dark with very intense urinous odor.
Nitric acid, dark, smelling like horse urine.
Sepia Sepia, offensive and sourish.