dehydration probably won't cause this symptom but many other conditions can. usually the cause of the hands and/or feet and legs turning blue isn't serious -- unless there are other symptoms involved such as shortness of breath or a fever. depending on a person's skin color the extremities sometimes can look quite blue. this is true of very fair-skinned people. i'd suggest your daughter get checked out for this. there are a few disorders that can cause this blueness of the extremities. sometimes these disorders actually point to other conditions that can be treated or should be watched as your daughter ages. i wish you both all the best!
will dehydration cause you skin to look blue. my 17 yr daughters hands and leg will turn blue. but it goes away after a while. will dehydration cause this. it started about 5 to 7 days ago.