I'm not even sure that gnats are actually the ones that "gave" us this "souvenir." That is, I haven't actually seen them. I did go outdoors, but I was outside of the woods, and it wasn't as if I went into any thick shrubbery, so I really think it's strange. I looked it up in an encyclopedia and found that adult gnats are small--about 1-5 mm.--long, so it's possible that I was bitten by a gnat from the woods nearby without realizing it. The male gnats are particularly active in the morning and evening. They apparently bite and pierce human skin and suck the blood from the cut. But it's not as though the blood comes gushing out of the bite, so it must be an appropriately small amount that the gnat can get with its small mouth.
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I think it might have been on the morning of the 29th when I was outside sketching the mountain villa we had been staying at. The garden of this villa was not completed and looked shabby so I filled it in and sketched it as I pictured it. I was just outside the entrance of the forest for about 30 minutes, so I must've been "perfect prey" for the gnats. At our home in Tokyo, we get a large number of mosquitoes in the summer and I get bitten by them a lot. My wife wrote about this in her book, Hana no Tabidachi*, but those mosquito bites go away after about a day. However, the "souvenirs" from our trip to the mountains don't just get swollen, the bites are "weepy", and, even after two days, they are still "making a strong statement". I guess I'm stronger when it comes to the mosquitoes in the city, but not when it comes to the gnats in the mountains. I've learned that I "shouldn't underestimate Nature", so, next time, I think I'll take along some insect repellent.
(*Not yet available in English)