What is the treatment for an infant with a rash on his genitals?

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Yes, looking at the image (attachment removed to protect patient identity), it is less likely a diaper rash. Usually, a diaper rash involves more of perianal region. It is less likely scabies if other parts of the body are not involved or no family history of scabies at present. Still, I will suggest having a good hygiene. Some sort of a fungal infection is possible if it is chronic. You can apply candid powder two to three times a day. Keep the area dry and clean. Avoid Ezinapi (Cetyl myristoleate, Zinc oxide, and D-panthenol) as of now. This can aggregate. The baby skin is very sensitive and hence avoid using baby lotions orbaby cream as of now. You can use coconut oil just to keep the area moist. Coconut oil and candid powder to be alternated every four hours. If the rash is not going away after two days then seek a pediatrician's help. Take medications with doctor's consent. Review after two days.

I hope this helps.

Thank you.