'pterygium inversum : A subset of general pterygium nail disorder is pterygium inversum unguis, the skin under the nail grows forward and pushes out from underneath. It may be hereditary or caused by allergic reaction to chemicals. The disorder must be treated by a doctor; the skin growing forward is filled with blood and nerve endings and if pushed back under the nail, may result in loss of blood and extreme pain.
Answered 9/30/2020
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