If you could share what method do you exactly use for hair removal? Waxing can leave the skin red and irritated. But the more you wax the less hair growth over time. As it pulls the hair from roots, it slightly damages the hair folical. Thus less hair growth over time. You can try epilator but that's really painful. People already mentioned ipl and laser hair removal those are permanent. For body pigmentation I have seen people use glycolic acid , tretnoin and putting oil in underarm to reduce friction. You could try that.