Bump on baby head

❤🧒👶Mommy👶🧒❤ • Mommy of a beauiful little Boy (09/11/2018)... Step Mommy to 2 teens

My son was about 6 months old when he was overly tired and threw himself back and hit his head hard on tile floors. He is 13 months and i still feel the bump. The swelling never went away. He is fine and reaches each milestone before most. Is this dangerous in the long run and what can i do?