Hello Cam, This is Dr. Klarida Papaqako answering your question. The main reason of bad smell in the skin or organs, is the bacteria or fungus growing in the skin. When they mix with the sweat, happen some reactions who give the bad smell. If I was your caring doctor I would do a gynecological exam, Labs to rule out sexually transmitted disease or other gynecological problems. At the same time, I would examine your skin to find if there is any evidence of fungal infection or bacterial infection in the skin (check for rash, scaly skin, pimples with or without pus, if the area in between legs is itchy). I would recommend that while consider do a visit at your doctor, keep the area as dry as possible, because humidity is the main factor that helps the fungus grow. Take care.