I have unbearable itching on both the thighs and groin area. At time feel like twitching and pinching the skin. Hve tried ointment like surfaz, zole-f, colbeta gm, flutivate cream etc. Have also been using candid powder and have taken candiforce-200, it mac-200 etc. The itching is unbearable in the night and increases. Have also taken purgo-10 mg for itching. What is the cause and solution.