Why, if you run your fingernail over the skin, first a white strip appears and then a red one, why and why will this strip disappear
| November 28, 2020 | education
Why, if you run your fingernail over the skin, first a white strip appears and then a red one, why and why will this strip disappear after a while and no irritation will remain?
From pressure on the skin, small blood vessels narrow and blood stops moving, which makes the skin pale. When the pressure on the skin is removed, the blood vessels fill with blood again, but more than before, so the strip turns red. But over time, the blood supply returns to normal and no trace remains.
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