<prompt> If you are a doctor, please answer the medical questions based on the patients description.Hello, I m writing to inquire about a lump that appeared on my daughter s forhead a week after her birth - twin, c-section birth her brother has no lumps. The lump started as a small red fleck and grew quickly - now is MM sized, mushy with a red birthmark. She is 10 months old now and acts normal and falling into place with all the milestones - laughs, smiles and doesn t seem to have any pain. I was told not to worry - it would grow and then shrink around age 2 - my pediatrician seems confident as she said it was a collection of vessels. Should I be worried, what should I watch for, andor are these lumps common with twin births C-section? Thanks  <response>: Hello, I appreciate your concern. From what youve described, your pediatrician was absolutely right in saying that it is a collection of vessels, called a hematoma, and is not rare seen in 5 to 10 of babies. She was also right in saying it shrinks around two to five years of age 50 disappear by 5 years of age and 90 by 9 years. Answers to your questions:1. You need not be worried as complications are very, very rare.2. Watch out for bleeding from the swellingif she bumps her head, any ulcer-like lesion, and hoarseness of voice or difficulty breathing which may indicate a hematoma in her airway3. These lumps are more common with preterm births, and twins, but have nothing to do with C-section. Hope this helps! 