Diabetic diagnosed with celluitis and was put on bactrim (sulfamethoxazole and trimethoprim) for 10 days.its been 5 days and i havr a funky looking blister is it ok to pop the blister?

Noo!!: Don't pop the blister, especially if you have a chronic medical condition like diabetes. It could get infected. If it's closed and not draining any fluid, leave it alone. It's part of the healing process. If it's spreading or looking worse, see your doctor.

Yes: Safe way to open lister is open wet dressing. Wet towel allowed to dry will open blister safely.

NO: You are diabetic and have cellulitis, which is an infection for which you are being treated by antibioitic. By rupturing the skin, which is what you do in popping a blister, you are potentially allowing more bacteria to enter. It is an unfortunate fact that diabetics are more prone to infection and have a harder time fighting the infection. So let the blister heal on its own and continue the bactr.

Have it evaluated.: Blisters may be small and superficial, but at time they may be deep. Have it evaluated by a professional and get the appropriate treatment. With the proper wound care you may avoid potential complications.