Ahmad b. al-‘Ays narrated from al-Nadr b. Suwayd from Musa b. Ja’far, peace be upon him, from his father Ja’far, peace be upon him, from his father Muhammad, peace be upon him, who said, concerning lesions (al-jurh): “Take fresh tar (qir) and an equivalent amount of the fresh fat of a goat (ma’z). Then take a new piece of cloth and a new container, coat the outside of it with the tar and place it on pieces of brick. Light a low fire under it from the morning till the afternoon.
Then take an old piece of flax and place it on your hand. Coat the tar over it and apply it over the lesion. If the lesion has a cavity, twist the flax together and pour the tar into the lesion.
Then insert the twisted flax into it.”