You can't even See it

When you look at me you can't even see it. It's not like it's marked on my head, or hand. i don't yell it out. I don't tell anyone, unless necessary. You look at me and you don't even see it. No lesions, no wasting, no sudden appearance. You can't even see it. Silent enough for you not to not notice. At work. At church. on the bus. Sitting beside you, and you still can't see it.