What are the means by which blood blisters heal?

Natural Process: With injury to our skin, inflammation occurs which means the area becomes red, warm, tender and with swelling. The swelling occurs under skin layers and causes them to bulge creating a protective fluid cushion we call a blister. As the area heals, the fluid will be resorbed or when no longer needed, the blister opens and the fluid drains. This should take about a week. Cover and protect.