Injury

Injury, also known as physical trauma, is damage to the body caused by external force. This may be caused by accidents, falls, hits, weapons, and other causes. Major trauma is injury that has the potential to cause prolonged disability or death.

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Sayyed Mohammad Al-Musawi, Sayyed Mohammad al-Musawi is originally from Iraq and heads up the World Ahlul Bayt Islamic League in London. Other than being involved in various humanitarian projects, he frequently responds to... Answered 3 años ago

If the risk is considerable, then it is not allowed to expose yourself or other human deigns to a risk of life. 
Wassalam.

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Zoheir Ali Esmail, Shaykh Zoheir Ali Esmail has a Bsc in Accounting and Finance from the LSE in London, and an MA in Islamic Studies from Middlesex University. He studied Arabic at Damascus University and holds a PhD... Answered 4 años ago

Bismillah

Thank you for your question. It is not considered tahir, but if the amount is less then the tip of the thumb to the first crease on your thumb, then it is alright to pray with that amount of blood as long as it has not come into contact with water. For the specific amount of blood there may be differences in opinion and so please also refer to the book of Islamic laws of your Marja.

May you always be successful 

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Zaid Alsalami, Shaykh Dr Zaid Alsalami is an Iraqi born scholar, raised in Australia. He obtained a BA from Al-Mustafa University, Qom, and an MA from the Islamic College in London. He also obtained a PhD from... Answered 5 años ago

Bismihi ta'ala

You would have to perform the ghusl in the the form of "ghusl jabirah", in the case where you are not allowed to get the injured hand wet.

Please watch a tutorial I have on this:

And Allah knows best.