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I saw your clinical picture (attachment removed to protect patient identity).
You have more dark marks from acne. We call them PIH (post-inflammatory hyperpigmentation). This takes time to fade off.
Once there is scarring, the most effective treatment for scars is a fractional CO2 laser.
There are medications to lighten the pigment.
- Kojic acid cream. You need to apply a thin layer over the forehead after washing your face in the morning and night. I suggest you use Demelan Cream as this has a combination of Kojic Acid, Glycolic acid, and Alpha-arbutin.
- Use a good sunscreen with 50 SPF (sun protection factor). Apply a thick layer on the whole face 30 minutes before going out. Apply this irrespective of the presence of sunlight. UV (ultraviolet) rays will be present even when cloudy.
- Use salicylic acid face wash to wash your face. I wish you get rid of this pigmentation soon.
For more information consult a dermatologist online --> https://www.icliniq.com/ask-a-doctor-online/dermatologist