You may be developing Melasma on the cheeks. It is called chaiyan in Hindi. First and foremost, sunprotection is very important. If you don't do that, it will never go. So this is required all your life. Secondly some creams are there which can reduce the pigmentation. Please send photos using online consult option for accurate diagnosis and prescription. Please don't use lomela as it contains strong steorid and can cause severe side effects.