Is there any medication that can help pigmentation spots on face?(i used sunscreen 50)i use bc-pills because i get terrible acne if i don't use them.

Hydroquinones: Ask your derm or plastic surgeon. Avoid sun, don't just block it.

Sun spots treatments: If the spots are from sun damage you can use a bleaching cream like hydroquinone. Many of these are available over the counter that you could try, stronger forms are available by prescription. You could also get a chemical peel or laser treatments. If the spots are dark or irregular you should always have them checked out by a doctor to make sure they aren't cancerous.