Realgar Classic Formulas … Natural Herb Library

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Resolves toxins and dries damp lesions ... Xiong Huang is used externally for sores, ulcerations, scabies, eczema, and snake or insect bites.
Kills parasites ... older internal and external use includes intestinal parasites and stubborn damp-toxic skin conditions.
Dispels phlegm and opens obstruction in a narrow classical sense ... historical formula traditions place it in acute toxic-heat or phlegm-wind contexts, but this is now treated with great caution.

An Gong Niu Huang Wan ... historic rescue-formula tradition in which Xiong Huang appears as a toxic mineral for severe heat-closed presentations.
External toxic-dispersing powders pair Xiong Huang with Bing Pian or camphor for ulcerated or parasitic skin lesions.
Historical parasite combinations use it in minute supervised amounts for severe toxic or parasitic presentations rather than for routine household use.

Traditional materia medica describes Xiong Huang as a warm, toxic mineral that resolves toxin, kills parasites, and treats sores and bites.
The same classical record that gives it power also explains why modern safety framing must be strict ... arsenic minerals are not gentle daily herbs.