A scab after piercing can be a temporary phenomenon and would pass away in a few days in the absence of infection. The pain and swelling would also pass off with time. However, you need to ensure that there is no infection in the tragus. If the pain and swelling increases, consult your doctor immediately as you might then have to go in for antibiotics. Infection in the tragal cartilage
can lead to cartilage deformation. Keep the area clean as much as possible and use the oil and antibacterial soap as directed.