Hello doctor.i have pigmentation problem my doctor prescribed me atret 0.025% overnight .can i use it in the evening for 5-6 hrs instead of overnight?

Yes: You can easily start out with such a cream with a timed application starting at a few hours. You can gradually increase the time used to meet your needs. If you find your skin irritated by overnight use you can cut back to 4-5 hrs or less, increasing it as your skin begins to tolerate the cream better. If your skin seems scorched, skip a day between applications.