Welcome to HEALTHCARE MAGIC..
I have gone through your query and can understand your concerns.
As per your complain Perodua ointment is a combination of Benzolyl peroxide and adapelene and the side effects that you are experiencing that are dry and itchy skin with redness is due to most probably adapelene that is a retinoid..
I would suggest you to stop using this combination and you can first of all condition of skin by reducing inflammation and for this you should do cool compresses over the pimples and the reddened skin and wash your face frequently with cold water..
Take anti allergics like Benaryl..
Once the skin soothes you can start washing your face with salicylic acid
and glycolic acid
Apply benzoyl peroxide
containing gel, do cold compresses, avoid oily food and sun exposure.
Exfoliate your skin twice a week using a gentle scrub and drink plenty of water..
Apply kojic acid containing cream and also abutin containing creams for reducing dark spots..
You can also go for microdermabrasion
and chemical peeling..
Hope this informations helps..
Thanks and regards.
Dr.Honey Nandwani Arora..