Using topical steroid on scalp diprosalic betamethasone dipropionate 0.5 the doctor told me its very strong which is medium potency steroid ?

CanResearchYourself!: e.g.: https://www.google.com/search?q=potency%20of%20topical%20corticosteroids, http://www.aafp.org/afp/2009/0115/p135.pdf. All steroids (derivatives of cholesterol) work by altering gene expression, worsen blood glucose control (Diabetes Mellitus) & suppress immune system functions (can thus aggravate infections). Often fairly safe short-term if young & apparently healthy, yet can also backfire.