<s>[INST] I was just wondering it doesnt seem to bother him until I try to put something on it, but my 18 month old has a lot of redness around his anus. I have twins and they exact same diet but its only occurring with one of them. What should I put on it and what do you think its from? [/INST] HelloRedness around anus is a kind of dermatitis which usually indicates lactose intolerance. I would suggest you to get a stool examination done for reducing sugar. It is not always necessary that both of the twins develop any disease or symptoms simultaneously. Apply some ointment like Happy nap/Rash free around the anus. Try to keep the area Chat Doctor. You can use Baby Johnson's Napkin for wiping. You can also give oral Zinc syrup as it helps in early recovery of dermatitis. Regards </s>