Likely your shoes are too small and/or your toenails too long. Fixing either/both should improve the issue.

I get them very frequently. Sometimes it is because of me being stupid with socks being too tight or whatever, but a lot of time it is simply from running too hard which makes the microvessels under the toenails explode. I run in Hokas that are actually kind of big around the toe box, and it get them anyways. No biggie for me, but if I was into wearing open toe shoes, I can see that being an issue :)

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Next races on the schedule: none at the moment

Well my shoes are the right fit as I buy them from a reputable running store with experienced runners as staff so I'm sure it's not that. And I'm pretty good about body grooming so my nails are never too long.

I'm thinking it might be more what alex_korr as mentioned about running too hard which puts too much stress on the micro-vessels.

That being said, I'm not really into open toe shoes but I do get some side glances (or should I say downward glances) when I'm at the pool!

Perhaps if your foot strike is way ahead of your body, your toes can push into the front of your shoe over and over again. Just a thought.

I'd go for checking the size of the shoe, your running gait and maybe your lacing. If you do land feet in front of your body you could end up pushing forward.

Most shoes have an extra lace hole which is under-utilised but, used properly, can anchor your shoe better to your foot. Have a look at this -

http://howtorunamarathon.net/Tying_Your_Shoes.html

If that doesn't sort you out then I would be looking at my shoe size. I have run large volumes in the past and rarely get any blisters or blackened toenails, off or on road. I usually end up half a size bigger than dress shoes. I like to have at the very least a good thumb width between my biggest toe and the end of the shoe box when I'm standing up in the shop. Feet swell when running so you need that extra space.

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Trust me I’m a doctor!
Well, I have a PhD :-)