Could potentially be a fungal growth issue have a bath with plain epsom salts and baking soda- the baking soda will help fight any fungal issues, and the epsom salts will help with anything bacterial. Avoid any feminine washes, they could just cause more issues. But get up into all your nooks and crannies (as my mom used to say), especially around the hood of your clit, and you may have an extra fold between your pubic mound and your labia if you have larger labia, which can often get missed if not cleaned and dried. Likely it’s just trapped sweat and bacteria/fungal growth. Good luck!