Anal fissure-PLEASE HELP

Je

My 4(almost 5) month old has anal fissure, a cut inside his anus. He got it when he had the flu and the nurses was checking his temp that way. I guess the plastic made a little cut and it got worse. Anyway, the doctors told me it may take a month to heal due to him having so many bowel movements but has anyone had this happen to their child and what did u do to help lessen the pain??? My baby is screaming in pain and I’m trying what the doctor said to do but I just want to know if actual moms have any advice.