Infant red buttocks rotten should be diaper dermatitis and skin breakouts and other causes, can be appropriate to use topical ointment, such as moisturizing cream, antibiotic ointment mupirocin ointment, etc., usually pay attention to local hygiene and cleanliness and dryness, every time after peeing and defecation, to use warm water for cleaning, diligent change of diapers. 1. diaper dermatitis: diaper dermatitis is due to improper local care, no timely replacement of diapers and diarrhea and other triggers, usually pay attention to timely replacement of diapers and local skin cleaning, keep dry and hygienic, if diarrhea caused by diaper dermatitis should be timely medical treatment to give the appropriate antidiarrheal treatment. 2. Skin ulceration: If there has been obvious local skin ulceration, there is the possibility of bacterial infection, you can use appropriate drugs such as mupirocin ointment, which will help the local skin ulceration to improve. Infant red buttocks rotten symptoms are mild do not need to worry too much, pay attention to the baby buttocks hygiene care, keep clean and dry, if the red rotten symptoms are serious, or the symptoms continue and do not see improvement, should go to the hospital in a timely manner to see a doctor for treatment.