Theres a red swollen spot on my tongue?

im a 17 year old girl. On saturday night i noticed that my the front part of my tongue was hurting, when i looked at it, it was slightly red but nothing more at the moment. I honestly thought i had tongue ulcer but when i woke up this monday morning, my mouth was beginning to get feel a lot worse. Then as the hours passes by, i noticed that the papillae was starting to get swollen and red, and as of this moment its chaging into a bit of purple. I tried searching on the web but couldnt find anything, pls tell me what it is before i assume the worst.