Ow burnss! kinda a funny story but i need help?

A cold pack may relieve pain along with Tylenol or Motrin. What I am most concerned about is if the wound is open you stand a chance of getting a nasty infection. The chemicals in the sparkler and bacteria may be in the wound. I suggest you have it looked at by a doctor or a nurse to see if any further treatment would be of benefit to you. Also, that type of firework is meant to be used outdoors......you can set stuff on fire! But I guess you know that now.