thanks for using Health Care magic .
I would be pleased to answer your question
You might have tried multiple medications however , the right medication may not have been prescribed to you .
For tan spots on the face could be either freckles , sunspots or post inflammatory lesions of pimples
You will need to get a few chemical peels
done like 20 % glycolic peel . it will help in exfoliating the skin and reduce and remove the marks. Use of a sunscreen is also essential . it will prevent the marks from getting darker and spreading .
Thanks and take care