Have a slight cut on bottom of penis caused by body wash irritation, minor pain if touched but missing skin area has yellow film on it every now and then, is it infected? can i use bacitracin on it and a band-aid?

It is likely infected. Apply triple antibiotic cream, available over the counter. You may use Band aid on top of the ointment, to prevent trauma to the affected area. Have a healthy diet, exercise 30 minutes/day, drink plenty of water daily so your urine is mostly colorless, have safe sex, no tobacco alcohol weed or street drugs. For nutrition: http://www.choosemyplate.gov/. Wish you good health!