My 8 month old had a really sore bum a week ago, to the point of it bleeding. Went to doctor who gave Dactacort, I believe a steroid cream, it cleared up eventually, but she's just woke in agony, has had a poo and we're back to square one, her poor bum is bleeding sore. Is this likely teething related or due to diet? I've stayed away from anything acidic since the last bout