hypopigmentation

thanks for your concern. Please i need your advice, i'm a dark-skin man of 22 years suffering from hypopigmentation , actually i think the problem escalated as a result of a cream i used called TRIDERM. i didnt  read the instructions before using it because it was in another language (i'm in a non-english speaking country). Now the center of my face looks lighter than my face and body as a whole, its very embrassing and shameful for me. Its been up to 2 yrs i've been suffering from the depigmentaion now and doesnt seem to want to cure. What can i do?