This old remedy works wonderfully well at drawing out imbedded objects in the body.
Heat some milk to a temp that is comfortable when placed on the skin. Add lots of cayenne pepper. Add bread pieces big enough to cover the injury and let the mixture soak into the bread.
Cover the injury with a bread piece. After that piece has cooled, use another soaked bread piece.
Just do this a few times and in a couple of days, thorns, cactus spines, splinters, glass, whatever, pops right out. The poultice draws the foreign object right out!