The main cause is coldness, therefore keep warm at all times. When infected: take a lemon and cut off the top. Put three pea-sized pieces of welding stone into the lemon. Put the lemon into warm ashes overnight. Boil camomile flowers and put into the lemon, then tie this stuffed lemon onto the upper disk of the backbone. Leave it there for 3 nights. If necessary repeat after a few days.