Welcome to HEALTHCARE MAGIC..
I have gone through your query and can understand your concerns..
As per your complain pimples can occur due to causes like :
-Clogged pores.
-Oily skin.
-Hormonal Imbalances.
-Bacterial infection.
-Inflammation
-Excess sun exposure etc.
On the other hands dark or black spots left on face seems to be due to Post Inflammatory
Hyperpigmentation that occurs due to pimples..
As you are already using Clindac solution that contains anttibiotic clindamycin, it is appropriate as well as Doxt tablet is antibiotic doxycycline commonly given for acne..
You should also wash your face with
Salicylic acid containing facewash..
Apply topical ointment containing
Benzoyl Peroxide..
Apply retinoids like Adapelene gel in thin layer on pimples at night time..
Do cool compresses over face..
Exfoliate your face twice a week to unclog the pores and remove dead skin..
You can also apply a sunscreen lotion when exposed to sun..
Avoid oily food..
For dark spots apply creams containing Kojic acid,
glycolic acid and arbutin..
Vitamin E gel can be applied at night.
Azelic acid preparations are helpful..
You can also go for treatment like
Microdermabrasion and chemical peeling..
Hope this information helps..
Thanks and regards.
Dr.Honey Nandwani Arora.