Hi, Thanks for writing in. These malformations may be associated with symptoms related to infection (pyelonephritis), obstruction (hydronephrosis due to pelviureteric junction obstruction) and urolithiasis. Vesicoureteral reflux is also commonly associated this may be responsible for the high incidence of pyelonephritis. Omnacortil is prednisolone and should be given only after discussing with senior doctors. There are many side effects of omnacortil and the benefit must clearly be understood when giving 20 mg dose to a child. I would suggest you please consult a pediatrician and then discuss the need for taking omnacortil after clinical examination. The soft tissue swelling in not clearly understood and might need detailed clinical investigations to confirm diagnosis.