Thank you for the query.
This skin tag is something that associates anal fissure
. If you try to look what is above it, you should notice a small wound. This wound is a fissure and this gives the pain when passing the stool.
You should visit your doctor for rectal examination
. To get it healed you should keep this area dry and clean, have sitz baths with Quercus Cortex
and avoid constipations and hard stool.
Hope this will help.