Erythromycin ointment can be applied to pregnant women. Erythromycin ointment can be used on pregnant women and children, even infants, and is a safe drug. Erythromycin can also be given orally during pregnancy, so it is not a problem to apply erythromycin ointment topically. Erythromycin ointment is mainly an anti-infective drug. If a pregnant woman has an infection, she can be given erythromycin cream, fusidic acid cream or Bactrim cream for topical application. If you have an infected skin lesion, you must also pay attention to avoid contact with water to avoid aggravating the infection. If you can’t diagnose the cause of the rash, it is advisable to seek medical attention in a timely manner, and it is not advisable to use medication on your own to avoid delaying the condition and causing the rash to increase and grow.