I've been using 2% HQ for more than 3 yrs now, and now my skin has stopped benefetting from HQ, and has become extremely sensitive to the sun, also, it has gotten quite darker and redder and thin again... My question is, if I stop using HQ, how much time will it take for my skin to get normal again, and recover from the damages caused by HQ? And these effects aren'y permanent by any chance, right?