Is a thorn embedded in the flesh considered a barrier necessitating the re-performance of ghusl and past prayers?

The jurists have agreed that the comprehensive wetting of hair and skin with water is among the obligations of ghusl (definition) (ritual bath). However, a group of scholars is of the opinion that a small amount of substance preventing water from reaching the skin is excusable. The preponderant opinion is the excusability of a slight barrier, and similarly, the excusability of minor impurities that are difficult to guard against. Therefore, a thorn, whether entirely embedded under the skin or with its tip showing, does not affect the validity of ghusl because it either does not prevent water from reaching the surface of the skin, or the amount of skin it covers is slight and excusable. Such minor matters do not affect the validity of ghusl, as Islamic law does not impose hardship and difficulty.