I had accidently cut my thigh with scissors while cutting hair it wasn't deep, but it bled a little bit so i stopped it by putting cold water and used bandage. later, i took it off and put some dettol. i light pinkish red around the cut on both thigh?

The redness could be due to inflammation that is expected with injury and may likely fade away in a couple of days. The thigh is an area that may be more prone to infection, so it is important if the redness is getting bigger, with more swelling or if you have fever to be evaluated by a doctor to see if you should be on antibiotics. In the meantime keep the area clean or use antibiotic ointment.