It usually starts small.
A prickle along your shin while you're watching television. Something brushes across your forearm, so you swipe at it — and there's nothing there.
You check your sleeve. You check the sheets. You look at your skin.
Nothing. No rash. No redness. No bite. Nothing that explains what you're feeling.
So you assume it's dry skin. You buy another moisturiser.
For a little while, it feels better.
Then it comes back.
Over time, you quietly adapt. You know which jumper lets you scratch without anyone noticing. You leave a leg outside the quilt because cool air helps. There's always a bottle beside the bed, and you already know roughly how long the relief lasts.
Eventually, you stop mentioning it.
Because every time someone looks at your perfectly normal skin, they look back at you as though nothing could possibly be wrong.
If that sounds familiar, keep reading.
Once you understand what's actually happening, a lot of things you've blamed on yourself begin to make much more sense.