Dips always hurt my elbows! Your probably using too much weight and doing an explosive rep on skull crushers rather than doing a slow controlled movement!

Change over to close grip benches and do some shoulder-tricep injections with deca next cycle and your elbow should have a good chance of healing.

When you go back to skull crushers never do over 6 to 7 reps or less than 5. Higher reps in this exercise kills my elbow!