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"[Plin. Nat. 20.70.] - DITTANDER: THREE REMEDIES.
Dittander is generally considered to rank among the caustic plants. It is owing to this property that it clears the skin of the face, not, however, without excoriating it; though, at the same time, the excoriations are easily healed by employing wax and rose oil. It is owing to this property, too, that it always removes, without difficulty, leprous sores and itch-scabs, as well as the scars left by ulcers. It is said, that in cases of tooth-ache, if this plant is attached to the arm on the suffering side, it will have the effect of drawing the pain to it.”
(The Natural History. Pliny the Elder. John Bostock, M.D., F.R.S. H.T. Riley, Esq., B.A. London. Taylor and Francis, Red Lion Court, Fleet Street. 1855.)