Below are the main rubriks (i.e strongest indications or symptoms) of Arnica in traditional homeopathic usage, not approved by the FDA.
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Black and blue
Itching, burning, eruption of small pimples
Crops of small boils ( Ichthyol; Silicea Silica.) Ecchymosis
Bed sores ( Bovinine locally.) Acne indurata, characterized by Symmetry in distribution.≡ more ...