English - Ma'ariful Qur'an - Mufti Shafi Usmani RA - Vol - 1
Surah Al-Baqarah - 2 : Verses 172 - 173

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The blood

The second thing forbidden in the verse is blood. The word, dam, (pronounced a, 'sum' in English) meaning 'blood' has been used here in the absolute sense, but, in verse (6:145) of Surah al-An'am, it has been subjected to a qualification, that is: (that which flows). Therefore, fuqaha' agree that congealed blood such as, the kidney or spleen, are clean and permissible.

1. Since flowing blood is what is forbidden, the blood that remains on the flesh after slaughtering the animal is clean. The Muslim jurists, the blessed Companions and their successors and the Ummah in general agree on this. On the same analogy, the blood of mosquitoes, flies and bed bugs is not unclean. But, should this be significant, it has to be washed clean. (Jassas)

2. As eating or drinking blood is forbidden, its external use is also forbidden. As the buying and selling and seeking any benefit from impurities is forbidden, the buying and selling of blood is forbidden and all income derived from it is also forbidden. This is because dam or blood in the words of the Holy Qur'an has been forbidden in the absolute sense which includes all possible ways in which it can be used.