sometimes I have small painfull slits around my vulvla, and some red sores

hi somes times have small painfull slits around my virgna and in my buttoks some time it is painful to pee and are very sore they come and go i ony get one slit or two at a time i have been with my husband for 6 years and he was a virgin when i meet him . thing is i have a 10 year old daughter and she has the same slit that is very sore in her buttoks aswell she has had it apper twice now i  would like to no if you have any idear what it could be as my daughter is not sexauly accivte im am wondering why she as got it . thanks