Is it necessary to shave OR wait for the bleached facial hair to wear off before IPL hair removal?

I would like to know if 1. it is necessary to shave my cheek & upperlips for the treatment because shaving has always made my hair thicker on my body 2. I always bleach my facial hair so is it necessary to wait for the hair to turn black again or can I just shave it to go on with the treatment because the hair under the root remains unbleached/black. I'm asking this because I will have to hide at home for weeks if I wait for all the facial hair to turn back black again. Thank you for the help!