i think it is caused by typing on the computer and having a higher-than-average keyboard. Most pianos I can touch the bottom of the keyboard with a slight lift of my knee. My keyboard I cannot do that. So that means my wrists will be in a bad position.

I don't go to doctors. What are they going to do about it?

Why have you got a higher than average keyboard then ? Not one of these old IBM PC jobs from the middle ages ? You could buy one of these sleek new ones - or sit higher. Sitting too low is never good and this will tax your wrists as well as the rest of your body. If you do a LOT of typing perhaps you've got beginning RSI (though not sure that manifests in the area you indicated). Yes I'd see a doctor or RSI therapist. But get the keyboard and chair sorted out first.

My keyboard has its own stand which is higher than real pianos. and my chair has a pillow that I sit on. But I have flattened it over the course of a couple of months . Maybe this is just a minor glich in my system like a fatiqued muscle.

my keyboard is I think 10 cm higher than it should be

Juufa, it's not just a minor glitch in your system. It's your body sending you warning signals. I know, because I was in the same boat years ago. I used to type a lot, hours without breaks and sitting too low. But what really bothers me the most is using the mouse. A few years ago, I was also practicing piano hard and now when I use the mouse a lot, I get a lot of pain in my wrists, (mostly the right). I thought for sure that I had carpal tunnel syndrome and went to two doctors. One injected cortisone into my wrists, (which wasn't any fun) and also didn't do any good. The other one sent me to a specialist who did a weird test on my arms and hands with electric shocks, and the results came back that it's not carpal tunnel, but tendonitis. They said there is no magic cure.(which made me cry right there in his office, something I don't normally do) I was really hoping it was carpal tunnel and I could get surgery to fix me up. The only thing to do is what the others here have said: sit higher, but also take lots of breaks where you stretch your arms and hands. And I sometimes where arm braces with wrist guards when I'm sitting at my computer. It keeps your wrists from sagging.