the.com/ingrown
When a body part decides the way out is actually the way in.
means Describes something, usually a nail or hair, that grows back into the flesh instead of outward.
from A plainspoken English compound: the prefix in- plus grown, dating to the 1600s, meaning grown inward — exactly what it says, painfully.
Toenail culpritBig toes suffer most from tight shoes.
Curly hairTighter curls trap shaved hairs back into skin.
Doctor's nameOnychocryptosis is the fancy ingrown-nail term.