Hi Thank you for your query I don t think you need to worry a lot about this. Minor asymmetry in a child head s structure is not a problem. It can be due to difficult labour, some hematoma which was present earlier and now has calcified. It may also be a mild bony overgrowth which is not much of a problem. Things tend to settle down or become less prominent as the child grows. Only worrisome thing can be abnormal fusion of a child s skull bones called craniosynostosis. Since a pediatrician has seen your child it seems unlikely. However you can take the opinion of a pediatric surgeon as well. Hope that helps God bless you