Have Pediatric Questions? Ask a Pediatrician.
Hi there. Is the lump protruding over (external to) the rib cage or does it seem to be under the rib cage lifting it up?
It would be wise to have this area examined by a pediatrician. It could represent a congenital abnormality of the skin, rib cage or an underlying organ such as the spleen. With a careful exam and appropriate imaging (e.g. ultrasound, CT, MRI) this can be properly diagnosed and treated, if necessary.