North Korean leader Kim Jong Un appeared with a dark spot on the back of his head during public activities last week — the latest health-related issue Kim has faced in recent years. 

The cause or nature of the large, dark green spot or bruise on the rear right side of his head, which was covered with a bandage in some footage, is still unknown and is difficult to diagnose using only images. 

It was visible during a military event Kim attended from July 24-27, as well as in footage of a war veterans conferenceand related events held from