Stork Bite?

Has anyone else had a baby with a stork bite on their lower back? My son has a large one and I just read stork bites are usually only on the face and back of the neck. Of course Dr. Google is scaring the crap out of me now saying birthmarks on the lower back could be a sign of spinal problems. My midwife did not seem concerned at all and our next appointment isn't until 6 weeks.