Thanks for the query. Dark spots could mean many things. I assume what you mean is probably post acne pigmentation or post inflammatory pigmentation. Targeting through a single agent may not always be fruitful. Meet a qualified Dermatologist to learn more about the diagnosis and treatment options. Combination of different therapeutic agents is always beneficial. Revlite I.e. Q-switched Nd YAG laser has been available for stubborn pigmentation and can be helpful when topical creams fail. Hope it helps.
Lasers are usually safe in experienced hands
Next Steps
You can meet a qualified Dermatologist with MD/DNB/DDVL/DVD degree for proper examination.
Health Tips
You can consult me online for personal recommendations.