Hi My 15 months old baby had herpes simplex virus some time ago, when she also had a blister on her thumb developed into a very ugly whitlow causing the nail to came out. With the use of ani-viral she improved and all the blisters around her mouth and the whitlow have gone. Now the new nail is growing, but we notice a blister on the finger with a white top. Not sure if it because the pressure caused by the new nail or she has a nail infection. Her temperature is also getting higher (38.7). The high temperature could be associated with teething going on, but I m concern about the finger.