This most often happens from a blow or fall; if you press on such a nerve, numbness is felt. Treatment of a hardened nerve is close to the treatment of hard tumors and calluses. In the sections of the Book on Simple Medicines and in the Pharmacopoeia, we have already mentioned the medicines necessary for this, and here we will mention only good, proven remedies. Light medicines include, for example, taking ten dirhams of Jewish bdelium, soaking and dissolving it in water, mixing it with the same amount of well-ground marshmallow root and making a medicinal bandage from it. Iris root mixed with cooled grape juice, or ushshak, galbanum and furbillune bound with olive oil grounds, also help. Or they take horehound seeds and use them as a bandage with maybukhtaj, or diahilun with half the amount of goat feces - this is extremely useful.