Leech-finger

Sing three Our Fathers on your leechfinger, and write around the sore.

Source: wiktionary

The Leech finger has Coll on it, the sage Hazel, who is the master physician, and is surmounted by Saille, the Willow of enchantment.

Source: wiktionary

Similarly, the other wound item above it, for an unknown swelling (uncufrum swyle) involves singing the Pater Noster thrice over 'your leechfinger' (ðine læcefinger, the middle finger) and writing the Latin formula around the sore as well as speaking it.

Source: wiktionary

For some, simply to stroke the ring finger over a wound was enough to heal it and it eventually became known as the healing finger or the leech finger. In parts of Europe it is still used today as the only finger suitable for scratching the skin.

Source: wiktionary