You shouldnt Bleach your left over hairs right after waxing, in my opinion i would tweeze them. and if you dont like to tweeze them, try bleaching them a few hours later.
Hello,
The most effective solution for treating dark line on lips is alexandrite and ND-Yag Q-Switched laser treatment. Please discuss these options with your dermatologist.
It is very difficult to precisely confirm a diagnosis without examination and investigations and the answer is based on the medical information provided. For exact diagnosis, you are requested to consult your doctor. I sincerely hope that helps. Take care and please do keep me posted on how you are doing.