This morning I suddenly saw this in the mirror. Is it something to worry about? (Photo)

It appears to be the color of blood staining of the skin AKA a bruise. Given the history, I would only be guessing what caused it. Anything that injured or disrupted the small vessels in the skin would be a cause. Perhaps aggressively rubbing the eyelid? If there is no affect on your vision it will likely fade with  time like a normal bruise. If it does not follow this course, I recommend you see an ophthalmologist. 

Experiencing a sudden bruise on your eyelid and in the corner of your eye can be concerning, but if there’s no pain or changes to your vision, it may not be serious. Stress, fatigue, or changes in sleep patterns, especially after long flights, can lead to mild bruising or swelling in that area. It's also possible that the bruise developed during sleep or due to minor trauma you might not recall. However, if the bruising worsens, you notice changes in vision, or if it becomes painful, it’s advisable to consult a healthcare professional to rule out any underlying issues.

Thanks for your question and the associated photos! This looks like a small hemorrhage (bleed) underneath the skin of the eyelid. This skin is incredibly thin and small blood vessels live right under the surface so they can be easily ruptured with pressure (even as minimal as scratching or rubbing your eyes). This will almost certainly improve on its own over time, however you can look into some different over the counter medications to help speed things along including arnica and bromelain. Though rare, it could also be a sign of underlying bleeding disorder and may warrant evaluation/blood testing by your primary care physician especially if you have had prolonged bleeding or other bleeding issues in the past.
Hope this helps! Kyle Kimura, MD

It looks like a bruise but best to see an ophthalmologist or oculoplastic specialist for in person evaluation. 

Thank you for sharing your question and photo. It appears that you had a small hemorrhage in the eyelid. This is not an uncommon area for hemorrhages to occur for no apparent reason. Fortunately, it will fade without treatment and is nothing to be concerned about if it is the only bruise on your body. If there are any changes, inform your doctor. Good luck.

It appears to be just a bruise.  It may just be from the long flight or maybe you bumped it in your sleep and did not realize it.  I would recommend using some warm compresses to help it subside.  If it continues to get worse or does not respond to the compresses, I would contact an eye doctor in your area.

Not at all uncommon and some people bruise differently than others.  If it starts getting bigger and expanding, definitely go see your surgeon.  Otherwise, it's just going to take a little time...

It sounds like you have a bruise and just need to watch and let it resolve. It will probably take about 2 weeks. If it is not improving and resolving every day you need to be seen by your doctor.Best wishes,Dr. Marcus Peterson

If there are no symptoms and you are only concerned with the appearance of the bruise on the upper eyelid, There is no cause for alarm and it will likely fade over the next week. It is it persists, progresses or recurs, seek medical attention.

No need to be alarmed.   The small hemorrhage will fade over time and it is nothing to be concerned about.  Follow up with your surgeon to confirm.