How Long Would It Take For Placentrex Gel To Clear White Spots?

hia recently i had a hair loss in my face so my doctor told me that i had alopecia areta so then he give me injections of tricort 10 mg but after it i had reaction in my face like white patches where he has given me that injections now for that he has suggested me to placentrex gel on that white spots pls suggest and how long these small white spots will be there after using placentrex gel thank you