Welcome to HEALTHCARE MAGIC..
I have gone through your query and can understand your concerns..
As per your complain Vitiligo
is a skin condition in which there is loss of pigmentation in patches in different areas of body thereby forming white patches on skin..
It occurs due to damage to the melanocytes in certain areas of body which are pigment producing cells producing Melanin and provides colour to skin..
As you said you have patches on your arms immediate initiation of treatment can help in preventing progression and can also help in faster resolution..
The medications advised to you that is betnasol forte that contains active ingredient Betamethasone
will help in reducing the destruction of the melanin producing cells by supressing body's self immunity and Momoz ointment that contains steroid mometasone
will help in repigmentation of depigmented skin..
In case if you do not get results in a period of about 2 to 3 months consult a Dermatologist
and get evaluated and he can do a thorough clinical evaluation and also advise investigations like biopsy from the depigmented areas..
You can also be advised spot Oxsoralen therapy..
can also be benificial..
In case of small areas skin grafting
can also be advised if other mechanisms does not help..
Hope this information helps..
Thanks and regards.
Dr.Honey Nandwani Arora.