Welcome and thanks for posting your query to Healthcare Magic.
As per your query you black pigmentation on face, hands, pimples on face, scalp
problem. In your query you have not mentioned the exact time period since the spot are present.
For the pimples part your doctor has rightly prescribed the medications but if you are not getting the benefit then you must talk ot your dermatologist
regarding the same. Minoz
in it which temporarily causes pigmentation which is reversible and very well vanish off after treatment. So do not worry if pigmentation is present after the starting the of treatment.
Hope these information will help.
"With good health wishes"
Dr Sanjay Kumar Kanodia
MD (Dermatology & STDs)