As I write this, it feels like hundreds of ants are biting my arms and legs.  I have a grass allergy, and prolonged exposure results in itching and small bumps appearing on my skin.  
It's been this way my whole life.
When I was a child I loved playing outdoors with my friends.  We spent countless afternoons wrestling in the grass and hiking through the forest.
This led to countless nights when I complained to my mother, "It feels like my skin is on fire!"  She responded by covering me head-to-toe ...