How Safe Is The Use Of Melacare On Skin ?

hello sir i m navin i was using tri o bloc creem it's keep verry effective for my skin but for some day i had visited other place without sun screen when i came back home so i have become verry dark.so i am thinking that i use melacare for one week becouse melacare do fastly fairness i will reach own color of skin tone and after then i will countinue my tri o bloc who was using from befor .so my question is,can i use melacare cream for one week and can i use tri o bloc after using melacare.plz sir help me.