The World Federation One Stop Fiqh

Ruling 336

If phlebotomy33 has been performed on one of the parts of the body on which wuḍūʾ is performed and one cannot wash it with water, it is necessary to perform tayammum. However, if one can wash it with water but water is harmful for him, then he must act according to the rules of jabīrah.

33 Phlebotomy is the practise of bloodletting, i.e. a treatment in which a vein is cut to release blood.