ANSWER:

This is an issue of dispute and the majority of scholars say that human blood is najis but I am inclined to the other opinion as there is nothing backing the opinion that states it is najis (except that which comes out from the private parts) neither from the Quran nor the authentic sunnah. Why would we make life difficult if this is not mentioned in the Quran nor the sunnah? 

QUESTION: A hanafi scholar said the blood from pimple or wound impact and break wadu, because in Quran Allah said blood is impure and it does impure the clothes too, they say may be it was sahabi own well to pray even bleeding, but vaste majority of other schalor say blood does not impact wadu, Please clear the rulling