Hello and welcome to healthcare forum.
is a break in the lining skin of the anal canal(depth), usually occurs as a consequence of constipation
and sometimes severe diarrhea
and leads to symptoms like pain during defection and sometimes but not always bleeding alonge with stool.
Treatment is by soothing ointments
, avoiding constipation, avoiding junk and spicy foods and if not treated by above measures then surgery.
I hope i have answered all your queries.
Best wishes for your health.