I am using kovijit ultra cream and photoban sunscreen. Since one month. It us good and effective. But suddenly my upper part of skin is turned black.

Question

As soon as u stop using it, slowly ur pigmentation problem will be back. 
You can apply aloe vera juice/gel from its leaf (fresh), not from readymade gels available in market.  Remove skin of an aloe Vera leaf. Take /scoop out gel. Apply this gel to your face skin. Wash with plain water after an hour. 
Stop using soap on face. Instead take a spoon of milk, add a pinch of turmeric (haldi). Mix n apply on face with the help of cotton. Leave for a few minutes then wash off. Apply moisturizer like coconut oil.
Simple Honey Mask--Before applying this mask, rinse your face with warm water to open up pores. Then apply honey and leave it on the skin for 30 minutes. Rinse the honey off with warm water; then rinse again with cold water to close the pores.
Use some sunblock with SPF (at least 50) every time you go out in sun. Apply it 30 mins before going out
Use umbrella when going in sun. Wear full sleeves cloths	
Drink plenty of fluids. Don?t be stressed.
For more details consult online

Karuna Chawla · Accepted Answer

As soon as u stop using it, slowly ur pigmentation problem will be back. 
You can apply aloe vera juice/gel from its leaf (fresh), not from readymade gels available in market.  Remove skin of an aloe Vera leaf. Take /scoop out gel. Apply this gel to your face skin. Wash with plain water after an hour. 
Stop using soap on face. Instead take a spoon of milk, add a pinch of turmeric (haldi). Mix n apply on face with the help of cotton. Leave for a few minutes then wash off. Apply moisturizer like coconut oil.
Simple Honey Mask--Before applying this mask, rinse your face with warm water to open up pores. Then apply honey and leave it on the skin for 30 minutes. Rinse the honey off with warm water; then rinse again with cold water to close the pores.
Use some sunblock with SPF (at least 50) every time you go out in sun. Apply it 30 mins before going out
Use umbrella when going in sun. Wear full sleeves cloths	
Drink plenty of fluids. Don?t be stressed.
For more details consult online

Sandip M Agrawal · Answer

Hi, it is unusual. Increase sun protection or hypersensitivity to medicine can do this. We have to see pictures. For now, stop all things.