<s>[INST] My grandson lives with me. He is seventeen months old. 13 days ago he had a cyst on his bottom which is now clear now I have noticed an open sore between his anus and butt cheek. It hurts when he has a bowel movement and when it is wiped. We do everything we can to keep it dry but it just wont heal. It s been about a week. Could very hard stools have anything to do with this? Thanks [/INST] Hi,Clean local part with plane water often and apply antibiotic cream.Passing hard stool will cause delaying healing due to rubbing against wound.It might require one course of antibiotic medicine if infection is severe.consult your doctor and get examined.Ok and take care. </s>