Red Mercuric Oxide Classic Formulas … Natural Herb Library

Primary Actions

Draws out toxin and attacks corrosive sores ... Hong Fen is a harsh external mercury compound used historically for ulcerations, abscesses, and damp-toxic skin lesions.
Removes pus and necrotic tissue ... older surgical practice valued it for debriding rotten flesh and helping chronic sores clean out before granulation.
Promotes tissue repair after the lesion has been cleaned ... classical topical use pairs the powder with other mineral or aromatic agents in tightly controlled amounts.

External sore and ulcer powders ... Hong Fen appears in old dermatologic and surgical preparations meant to draw out toxin and dry persistent lesions.
Debriding ointments for chronic abscesses or foul ulcers ... traditional use focused on removing decayed tissue rather than on general home first aid.
Parasitic or itchy skin washes and dusting powders ... historical applications now interpreted with strict modern mercury caution.

Traditional materia medica describes Hong Fen as acrid, hot, and highly toxic, used externally to attack sores, remove pus, and generate new tissue.
Later surgical usage treats it as a specialized debriding agent rather than a daily medicinal powder.