UNDERARMS HELP!!

So this has been happening under my arms for quite some time now. I did go to the Derm and they told me it is because of weight gain?? They gave me a steroid cream to put under my arms but it hasn’t helped me at all. I have googled my symptoms and I’m starting to think it’s eczema. Does anyone have any idea what this could possibly be??

It gets super itchy and scaly , I sometimes scratch and make myself bleed. Also clear musky water leaks out. Please help!