If the rash is between the legs above the penis it is unlikely to be a diaper rash
ans this is not the typical location of a diaper rash.
A diaper rash will subsequently resolve on wearing loose clothing and can be effectively treated by keeping the area clean and dry.
If the rash has not resolved despite the use of drma dew and siloderm, it could possibly be inflammatory and settle with siloderm mixi.
However for skin lesions it is always wise to get them evaluated with your doctor first. Another option is to upload and send a few clear photos of the lesion for an exact diagnosis.
If the lesion is very itchy and has clear boundaries, it is possible that it could be a fungal infection
This will settle with miconazole
I hope I have answered your query.