Applying clobetasol g can be very harmful especially on face if applied without doctors guidance. It can lead to adverse effects on skin like thinning of skin, redness, hypo pigmentation, acne and can also become steroid dependent or addict. . Cause of white spots has to be found first. It can be due to many reasons depending on its nature and texture like sun allergy, nutritional deficiency, or xerosis. Proper moisturizer, mild soap, sunscreen will help. Visit a Dermatologist if does not recover.