Hi welcome to Health care magic forum. Most probably it is the labia minor of the vegina, some proportion of ladies at the age of nearly 20 find the grouth of the labiaminora to out side beyond labiomajora. the sensitive part at the hood is the clitoris
. it is the only part responsible for the sexual satisfaction, and orgasm.
There is nothing to worry about about , it is not an obstacle either to sex, child birth , or any thing else.
Wishing you got the reply, and thanks for calling.