My daughter has blue-ish fingernails and a low fever (100.1). is this a concern?

Need more informatio: We can not really answer your question, we need more information as to how old she is, has she had any medical problem since she was born, does she have any other symptoms bluish nails need to be examined to make sure theseare blue, and if these are blue it can be due to cyanosis or some other causes and needs to be diagnosed.So check with your pediatrician or your family doctor.