What is happening to me?

Recently, my skin has become very dry, especially around my joints—like my hands and toes. It’s gotten to the point where it almost looks like fish scales. I’ve also noticed extremely dry, tight skin at the corners of my lips.

I have no idea what caused this or when it started. It just appeared out of nowhere, and it’s starting to worry me. I haven’t made any major changes to my routine, so I’m confused about what could be triggering it.

Age about 17-19

Has anyone experienced something similar? Any ideas what this could be or how to deal with it?