You either have a yeast infection or you may have a high acidic content in your body. See the doctor for medications. Cultured yogurt is also good for you and you should have it every day to help...
It still sounds like an STD to me. You could have gotten it from oral sex or from being masterbated by your partner. You should go to the doctor and have it checked out. It could be nothing, it could...
May be a yeast infection or an STD talk to your doctor ASAP to get it checked out if it's a yeast infection they can prescribe something to treat it, if it's an STD it's better to find out sooner...
The only thing you can do is stop worrying about it!
Fat cells around your genitals are in direct proportion with the rest of your body. If you are overweight - you will have a layer of fat here...