Ashtangasamgraha 20.18

20.18

Suśruta, on the other hand, recites:

"Pitta when inflamed goes to sourness; śleṣman, to saltiness."

Therefore, attentive, one should properly observe these forms and actions of vāyu and the others by means of scripture, direct perception, and inference;

and immediately thereafter, having taken the region, season, dosage, and so forth as authoritative criteria, one should promptly proceed with treatment.

And here it is said:

Curd cream mixed with pippalī and rock salt, rubbed on copper, relieves swelling, friction, lacrimation, and pain.