|Bursitis of the elbow|
So what was the cause? I've no idea but I think it was probably overtraining my elbow with pull ups and push ups since it began to click a couple of weeks ago while doing those exercises. According to my instructor, it is common also among judoka after repetitive training in Seio-nage. This is the first time I have had bursitis and it may be age related, who knows.
P.S. Jiu-jitsu was hell today in the heat I felt like collapsing and it's only May. The worst is yet to come.