my little girl had her first dental cleaning yesterday including 4 extractions. she went home and was very active since, act just like normal. i didnt see this bruise until tonight. i actually bathed her and dont remember seeing this

how did it happen...it never happen before...does anyone know what is this?
she is on clindacure for post dental cleaning.
http://i137.photobucket.com/albums/q...i/IMG_4799.jpg
doesnt seem like she is hurt when i touch it

i will take her to the vet early in the morning tomorrow