Blood From a Wound
Question :

If I have a wound which has not healed and is still bleeding, what should I do when I perform prayers?

Answer :

As long as the wound has not healed and the blood flows naturally from the wound, one can offer his prayers in such a state.
This exception does not make the blood tahir, If you touched the wound with your hand, and it becomes najis with blood, you must purify it before offering the prayer.

Najis Clothes
Question :

Can I offer my prayer when wearing clothes that has blood from a wound even if the size of the blood is little?

Answer :

If the blood on it is less than the size of a 'dirham' – which should be considered to be no more than 2.3cm as an obligatory precaution – then it is exempted during the prayer from the rule of najasah, and one may pray with such clothing. However, such clothes are still najis, so if his hand touches the blood on the clothes with transferable dampness, then he must purify the hand before offering the prayer.

Cut in the Arm
Question :

I have small cut on my arm, and the blood on my arm is less than the size of a 'dirham'. May I perform wudhu on it when the blood becomes dry?

Answer :

If the wound is on the parts of the wudhu then it is obligatory to remove the dry blood – even if it is less than the size of a 'dirham' – and make that part tahir in order to perform the wudhu.