Q: If a very small amount of blood or pus comes out (and was removed) from a wound or cut, will wudhu break?
A: If it does not surpass the area of the wound on it’s own and was removed through dabbing it or wiping it with a tissue etc, then the wudhu will not break. However if blood continued coming out and one continued to dab it and one feels that if one had not dabbed the wound the blood or pus would have surpassed the area of the wound, then in this case the wudhu will break.
And Allah Ta’ala (الله تعالى) knows best.
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