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Does finger flesh be blackened by hydrofluoric acid need surgery?
Generally, hydrofluoric acid burns that have not been treated with hexafluoroling need surgical debridement. If a large area of necrotic area or black bone is found during debridement, amputation is needed.

It is difficult to judge whether amputation is necessary simply from the appearance, but also depends on the degree and depth of pain and the severity of skin injury.