I have psoriasis too so totally understand that. It may not be that, but it doesn't help. It could be that you're accidentally touching the touchpad as you type. They're so damn sensitive it only takes a brush with a sleeve. I never use them as I prefer trackballs so disable mine. Laptop keyboards can go wrong, though, so it might be that it's on its way out. You can use a usb one with a laptop, though, so it's not all doom and gloom if it does go. Awkward to use at first but saves an immediate big repair or replacement of laptop cost.