My 2.5 year old baby has constipation for last 1 year. He passed stool sometimes daily and sometimes once in 2 days. But his poop is very thick and hard and darkish . He takes arround 15 minutes before passing it. And runs here and there until he pass stool And he put down a long thick and hard potty stool. And he feel relax. Due to this hi skin of anus got teared and red and he keeps itching it. I have given adequate diet liquid still stool consistancy is thick hard and  slipery. Please suggest medicine for long term and cream for anus itching due to constipation.