Suggest Treatment To Remove Pimple Marks From Face

hello, I popped a pimple on my face a long time ago. There was a lot of blood and after sometime the blood clotted on my face and it doesn t fade at all. The pore closed and the clot remains under my face. It looks black and gets more black whenever I disturb it. It has been six months and I ve used many creams but still,result is the same. I m losing my confidence to face people. Please tell me solution for my problem.