My tooth really really hurts . next to it on the gum there is this weird looking

[Ninjas are people too!!!!]

thing white colored read on? ok my tooth hurts really really bad . its my root canal tooth(im 12) . on the gum were the tooth is there is this thing that's white and has a little bit of purple around it. it looks kinda like its pushing out but kinda like it is caving into my gum. the root canal was for a baby tooth that was not gonna come out for a while . i had to get a root canal cause my filling got pulled out of my tooth while i was eating a m'n'm blizzard from dairy queen . what do you think is the problem with my tooth.
plz help its really hurting and my parent's r asleep with my baby brother so if i get on up i have to get them all up.
plz help thx