What are the treatments for red bumps on the buttocks?

Patient's question:

The child just born doesn't know what's going on, there are always red spots on their body, and they are spitting up milk. What are the treatment methods for red bumps on the buttocks?

Doctor's answer:

Possible Diagnosis - Diaper Dermatitis
It is a type of contact dermatitis, primarily caused by infrequent diaper changes. The condition results from the decomposition of urine by ammonia-producing bacteria, which generates a significant amount of ammonia that irritates the skin. It is most common in infants. The affected areas include the groin, perineum, and buttocks, sometimes extending to the inguinal region and lower abdomen. The presentation includes large areas of erythema, as well as maculopapules and papules with clear margins, consistent with diaper-wrapping patterns. If left untreated, it may progress to pustules, erosion, and ulcers. Treatment should involve frequent diaper changes, maintaining local dryness, and minimizing soap use to avoid further irritation. Topical zinc oxide ointment may be applied.
Traditional Chinese Medicine (TCM) considers this condition to be caused by poor hygiene of the external genitalia, leading to damp-heat accumulation in the skin. Treatment should focus on clearing heat and resolving dampness.