Japanese Dock Root Classic Formulas … Natural Herb Library

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Clears heat and relieves toxic skin lesions ... Yang Ti Gen is used topically or internally for tinea-like eruptions, boils, itchy damp lesions, and inflamed skin disorders.
Cools blood and reduces swelling ... the root is chosen when heat and irritation are obvious in sores, nodules, or inflamed tissue rather than when dryness or deficiency dominate.
Moves the bowels in heat patterns ... its bitter descending nature gives it a stronger opening and draining profile than the edible dock image might suggest.

Yang Ti Gen San ... topical damp-itch and tinea-style skin logic.
Luo Li San type pairings ... a traditional handbook lane for nodular or scrofula-like swelling.
Fresh-root or vinegar-rub applications ... practical folk use for stubborn parasitic or damp skin eruptions.

Classical and handbook-style usage emphasizes fresh or juiced root on skin disease at least as much as internal decoction use.
Its bitter cold descending profile explains why constipation and toxic skin patterns sit closer to the center of use than tonic or nourishing claims.