Dry Blood under the Nails
Issue No.107-If the blood which dies under the skin or nail due to being smashed is no longer called blood, it is ṭāhir. However, if it is still called blood, as long as it is under the skin or nail, it will not harm ghusl, wuḍū and prayer. However, if the bruise is punctured and it is not harmful or very difficult to remove the blood, it should be removed. But if it is difficult to take it out one must wash around it and pass a wet hand over a piece of cloth placed on it in order to make wuḍū and ghusl, and, as a recommended precaution, tayammum should also be performed.