Please come out of this creamopathy.....
First thing to be successful in treating a disease is to know what it is, or at least how it started?
If you have history of some casual unprotected sex then you need to get yourself checked for possiblity of Sexually transmited Diseases panel.
If not then it may be local allergic reaction
to dyes/fabric from new under-garments, a reaction to sweat in hot and humid environments, viral or bacterial infection.
Please get a CBC and Urine routine and culture to get an insight in to the etiology.