Swollen Labia.

So tonight my boyfriend and I were 69ing and afterwards I noticed a burning in my vagina. I put my hand down to touch it and it felt weird so I looked only to find that my labia is extremely swollen and starting to swell. It's also starting to look bruised and it hurts really bad. Is it just from him sucking to hard? Kinda like a hickey? Has anyone else had this problem? If so then how long will it take for the swelling to go down?