Hi, my son is just 18 he was diagnosed with crohns disease in September.He has had a pain in his right bum cheek and slightly in the left for 2 weeks now.He s been to the docs twice and was sent away with a gel the first visit and some ibuprofen the 2nd.neither helped really,the ibuprofen made is tummy sore.yesterday he found a small lump on his cheek which hurts to touch.The doctor said on his visit its syatica but he s done nothing physical at all.It s hurting to move,sit,lay down.He said its only on the cheeks and not his legs,please help.