My feet hurt from pointe..?

they don't hurt when i am dancing on pointe or when i have my pointe shoes on, but just when i have them off. It is only left foot (my weaker foot) and it is just the ball of my foot that hurts. i asked my dance teacher about it and she said it was most likely bunions.. she told me to get toe spacers, and i got them, but that was weeks ago and they still hurt.. :/ any suggestions?