Hi I'm 13 And I Just Fell On The Stairs.

Hi I'm 13 and i just fell on the stairs. My mother is putting my younger brother to sleep right now so i figured i could use some help from a professional. When i fell, not only did i cut my mouth i have something that appears to look like a blood blister. It is small has a dark colour and each time you press on it, it hurts so much! I have applied ice on it for the last few mins. The problem is i would want it to heal a bit before i go to school tomorrow. Also each time i drink water, it hurts. I have pool tomorrow and i am wondering if i should not go in because of my mouth pain each time it contacts something. It would be great to know your opinion on what to do about pool and how i could heal it. Thank you