Waxing result in frictional hyperpigmentation. If u have pigmentation at present.. u should get it it examined. Treatment will be decided after severity of pigmentation. There are various options including lightening creams, Chemical peels, laser.
Superficial peels will not cause further darkness rather it will help to reduce hyperpigmentation caused by waxing.
Next Steps
If u have dark hairs. Best to do Permanent hair reduction with LASER.
Health Tips
Avoid frequent waxing.
If u r obese.. Reduce weight.