I am experiencing ear lump or bulge in my ear concha, it is green ish grey

Cyst versus mass: A lump in the concha could represent, a cyst especially based on the the green/gray color. If it continues to grow, it can rupture and can get infected. The other option is a tumor might be benign. A cancer is possible but less likely at 21. You should see a doctor to examine and treat it so that there is not scarring of the ear cartilage. An infection or continued growth could deform ear