Sounds like a yeast infection. If you wash and dry, and then powder, but you find it still gets smelly and sticky, it’s a yeast infection. Anyone can get this, it is not a sexually transmitted condition, it happens when an area is very moist and bacteria can grow in that environment. You need to keep it clean and dry, first of all. Next, you should see a doctor to get a diagnosis and an anti fungal cream, but you can also use an over the counter one ( usually found in the feminine care section). If worse comes to worse, I have used rubbing alcohol on cotton pads to clean and treat, it hurts the first few times you do it, but it is cheap and effective…..I’ve had a flare be gone in four days with this method. Good luck!
First, make sure that you are keeping that area clean and dry- you can even use a powder to help keep it dry. If that doesn't seem to help, go ahead and go to your doctor so they can check to see if there is another issue (such as a fungus or bacteria causing the rash/issue).