Hello. My Daughter Had A Fall And Had 10 Stitches

Hello. My daughter had a fall and had 10 stitches in her chin. It has healed nicely but now there is a bump in her chin. It feels hard and she's afraid it won't go down. Her accident was only 12 days ago. Can it be scar tissue already or just swelling. If swelling will ice help. Her stitches were removed