I woke up this morning with a bite or sting on the back of my hand, near the knuckle of my index finger. It was a little swollen and itchy, nothing unusual. I took my usual 360mg Fexofenadine (for a different condition) and thought nothing more of the bite.
But it's been swelling and getting hotter all day. It's now swollen from nearly my wrist up to the first joints on index and middle fingers, across 2/3 of the back of my hand, and into my palm. I'm home from work and have an ice pack wrapped around my hand. I can use my hand, but I can't make a fist
When should I worry? How long do I give it before I need to show it to an HCP?