I noticed about a month ago, the shape of my 10 year old son's finger nails have changed. I am the only one who clips his nails,so no one else notices the change. I went on line and saw pictures of clubbed finger nails. Some were very severe,and some looked very similar to my sons. 3 years ago,he developed an awful infection in his left knee. After surgery to drain the knee, 5days in Children's Hospital of Philadelphia, blood work was positive for Lyme's Disease. He recovered well,is an active healthy boy and does very well in school. My question is do children present ,the kind of clubbed finger nails that are a tell tale sign of an underlying problem? I'm sorry I thought this was a free question site.