Try using athletes foot cream/jock itch cream there. Make sure you are thoroughly dry after bathing before putting it on. (Like the person before me said) if it doesn’t improve it may be something else
There are many causes of itch. The most common are tinea (fungi) or candida (yeast). Both respond to clotrimazole which is available OTC at discount stores. If twice daily application does not improve in 48 hours, it is likely NOT tinea or candida.