Hi..
Welcome to HEALTHCARE MAGIC..
I have gone through your query and can understand your concerns..
As per your complain dark patches after healing of pimples occurs due to Post Inflammatory
Hyperpigmentation and such kind of hyperpigmentation takes a long time to resolve, so you will have to keep patience and maintain consistency to follow the treatment..
I would suggest you to start washing your face with
Salicylic acid and
glycolic acid containing facewash..
You can apply creams containing
Kojic acid, glycolic acid , and arbutin..
You can also apply Vitamin E and C containing creams..
You can also apply Licorice and Grapeseed extract containing creams..
You can exfoliate your skin with a gentle face scrub twice a week..
You should drink plenty of water ..
Limit sun exposure and always apply sunscreen lotion when exposed to sun..
You can also go for treatments like
Microdermabrasion, dermal rollers, chemical peeling, Photofacial etc..
Hope this information helps..
Thanks and regards.
Dr.Honey Nandwani Arora.