My baby is 12 days old and we found a small, hard cyst-like spot on her back a few days ago. The doctor said it was fat necrosis stemming from trauma during delivery and that it should resolve itself. Since then, the first spot has virtually disappeared and another one has appeared on her arm. I read online that babies with fat necrosis may develop hypercalcemia, which has its own list of complications. The doctor never shared this information with us. We are going back to the doctor next week and I plan to discuss further with him, but wanted to see if anyone has had this experience.