These past few days, there have been patches of red on my buttocks.

Patient's question:

No

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 excessive ammonia that irritates the skin. It is most common in infants. The affected areas typically include the groin, perineum, and buttocks, sometimes extending to the inguinal region and lower abdomen. The lesions present as large areas of erythema, and may also include maculopapules and papules with clear margins, consistent with diaper-wrapping patterns. If left untreated, it can 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.