Hard to say: Blood is usually a reflection of tissue injury. Where/what was injured in that area is hard to pin down without looking. Perhaps you can position a mirror & light in a way you can see. Most such scratching produces a shallow tissue tear that self heals. Just keep the area clean.
Answered 2/25/2018
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A doctor has provided 1 answer
A doctor has provided 1 answer
A doctor has provided 1 answer
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