My skin was itchy so I scratched it, but strangely it hurt.

Today, one side of my skin wasn't itchy or painful, and I didn't feel anything. Then, I suddenly looked at my thigh and saw a scab. The problem wasn't here. Of course, if I'd been itchy or injured in that area, there would have been a reason. But that's never happened before. I was seriously injured here and now I have a scab. I don't know why. It's not itchy, nor was I injured anywhere. There was definitely something wrong with this area, and the wound has healed, but I can't figure out exactly what's going on. At first, I was worried it might be shingles, but it doesn't seem to be. My skin is starting to hurt a little, but it doesn't hurt when I press on it, and it's fine now. But why is my skin suddenly getting so flaky?