Dont play around with pigmentation creams that you can buy in any shop. Too many risks involved. Have you not seen the programs or the articles written about this, the risks and desaterous results they can have?
If you want something to change to color of your skin, go and see a specialist. Either at Hamad Hospital or a private doctor. A good dermatologist is Dr Hassan Abdullah who has his clinic on D ring Rd, near the airport.
Your skin, and specially your face is too precious to risk it.