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Could anyone tell me what these red spots are on the leaves?

I noticed them when I first got the tree and didn't think much of it, but now I'm worried that something's wrong

Thanks

I rustled the foliage of my tree with a piece of paper beneath, and I didn't see anything moving afterwards. I can't see any webbing anywhere and I've spent quite some time looking at the leaves, especially the underside, with a magnifying glass and haven't been able to see anything

Hi, Valkyrie2271, I did a quick search on Google and found an alarming possible reason:
"Actually a group of fungal diseases, anthracnose is also known as twig, leaf or shoot blight. The symptoms of anthracnose vary, but on the Chinese elm, typically take the form of spot-covered, dying leaves and cankers. To prevent the disease, Chinese elms should be planted well apart from one another, reducing humidity and allowing proper air circulation and the sun to dry them faster, making it harder for fungi to thrive. Small cankers can be removed, and in winter, diseased limbs should be pruned. "
But there are lots of other possibilities, including overwatering.

I looked up anthracnose and most of it sounds about right, but everything seems to mention that the spots are black, whereas mine are red?

Some articles say the spots will turn from red to black; I really have no idea, as I've never had anthracnose on my trees.

It probably isn't helped by the fact that I keep my tree indoors (although on a windowsill with a lot of sunlight and good airflow), so I'm going to be moving it outdoors in the coming weeks. I just have to increase my security a little as some things were stolen from my garden not too long ago, and transition it to the outside.

I going to try following what I read and cut off the infected areas and hope that this doesn't happen again as I learn more about caring for my bonsai.

It is a little disheartening to be dealing with an infection after only a couple of weeks of owning the tree, but I'm going to do what I can

I cannot tell anything from your pictures. If you want advice, you have to have a good close-up of what you think is an issue, and an overall picture of the plant to get an idea of the overall health. Plants are living things, and their tissues can get damages in lots of different ways.

Generally, I feel people on this forum jump to disease/infection way to quickly.