Thanks for writing in.
You can apply Glyco A lotion over the darker areas at night.
Use a good quality sunscreen in day time every 3 hourly starting at 9 in morning.
SPF of 50 for face and SPF of 15-30 for body is good enough.
Take a lot of lemon juice daily.Also you can take vitamin C
For lips you can Use LIPZ cream twice daily.Also you can apply honey over the lips at night time.
I encourage you to visit a qualified dermatologist
for proper diagnosis and treatment.
Hope this helps.