I can notice a grey color skintone on my nuts , my groin area and near my butthole , which itches and burns ,especially at night . its been for one and a half month . i dont know what to do , please help me?

Lesions have persisted for more than a month so you better see a doctor, preferably a dermatologist, for the correct diagnosis and treatment. Symptoms of skin problem are almost always worse at night when you are less detracted from the environment. Applying the area with lidocaine cream 4% (OTC) at night in the mean time may give you some relief + no scratching + avoid strong soap. Take care.