A course of antibiotics usually ten days easily treats a UTI, says Dr. Sometimes, it needs to be drained. Notify your pediatrician if you do; if left untreated, a UTI can cause kidney damage. This can occur after the skin becomes raw and irritated possibly as the result of a diaper rash , says Monique Regard, M. They generally resolve on their own and will certainly disappear when estrogen production kicks in during puberty. Scar tissue in the penis opening can cause the opening to narrow.