Mullein poultice
Lay a few mullein leaves in a dish (or for a splinter, just part of a leaf). Pour in a little boiling water to soften the leaves. Leave them until they are cool enough to handle, then place them on the affected part as your poultice.
Hold the poultice in place with a bandage, if possible, and it’s useful to keep it warm by using a hot water bottle pressed against it.
This treatment works for removing splinters, can draw boils, soothe an aching back and forms of lymphatic swelling, especially of the throat. Indeed, mullein is a member of the Scrofulariaceae, a plant family named for its former use in treating scrofula (tubercular swellings of the neck and throat).