Vulvar hematoma? Burst blood under skin on labia

Hi there, hoping someone may have experienced what I’m going through at the minute.

A couple of days ago I thought I could feel slight discomfort down below, almost as if I had walked into something, but I was very busy and didn’t even have time to think about it too much. In the shower the other day I looked down and noticed a large, long, what looks like blood under the skin was lined up along my labia majora.

It gave me quite the fright. I then noticed higher up, near the mound, it felt a bit tender to touch and I thought I could feel a slight bump under the skin, almost like an infected spot/cyst was there. But I can’t be sure.

Has anyone ever experienced something similar? The dark blood the whole way down my labia has concerned me the most. I don’t recall any trauma to the area. I did take up cycling at the gym in recent months, but it has been at least 4-5 weeks since I’ve been.