I don't know. It was the same ants in the same spot that got me recently two months apart. Medium sized, didn't appear to look unusual. Maybe I'll go back there and take their picture, but I'm afraid to do that. Maybe if I wear heavy boots (I usually wear sandals now because of my nerve damage - neuropathy - problem).
My troubles with insects started over twenty years ago. I was trail building north of Tucson when I felt sharp stings in my legs. I thought it was cactus thorns, but I couldn't pull my trousers down to see because there were women around. When I got to a private place I saw huge ants with gigantic pinchers hanging on to my leg, numbers of them. That was followed that evening by unbearable itching that ordinary anti-itch potions wouldn't even touch. Then, not long after, I had crawled under my truck out in the desert to fix something and this time it was tiny ants that got me. The ensuing itching was so bad I went to the emergency room at the hospital. I had read about bicyclists in Thailand who were bitten and got the fearsome itching and they went to the hospital and were given a shot which cured it instantly. But the Tucson hospital, after making me wait a long time (even tho I knew the nurse at the front desk) only gave me the same useless anti itch stuff that you can buy in drugstores. And then shortly thereafter I was bitten by a bee which also caused a bad reaction.
I'd spent much of my life outdoors and been bitten by bees, wasps, etc. before and never had a bad reaction to insect bites, with the exception of whatever bit me by Death Valley.
Then over twenty years passed with no problem, but about three months ago the ants bit my bad foot and caused the pain and swelling and fearsome itching. I tried everything on the itching but the one thing I found that helped was something called Cymillium which I luckily bought years ago and is apparently no longer available (tho it's still online). That helped. I also took methylprednisolone 6-pack or whatever it's called. That seems to knock it out in a few days. Also, ever since the old incidents I've carried benadryl anti-allergy pills and meat tenderizer and I took 2 of the former and rubbed in the latter as the ant bit me, but it seemed to do nothing.
Two months later in the same exact spot the same exact ants bit me again (I had sort of forgotten about 2 months before duh). This time the pain was even much worse than the last time but this time it was not followed by the unbarable itching (see photo). I had been given various anti-pain medicines to use for my neuropathy and I didn't know what to do so i thought of which of them caused me the least problems and i selected the fentanyl pain patch - and it helped and I was able to sleep.
Now I carry benadryl - i was told to take two initially and then continue taking them - 2 more a few hours later, something like that), AND a methylprednisolone 6 pack, so I'll do those immediately in the unfortunate event that ants get me again.
All this would probably be useless in the event giant ants, like in the 1954 movie "Them", bite you.