I came here looking for an answer to the exact same thing and as soon as I saw Elsha's note, I realized what it was. I too was at a Home Depot! I bought and assembled a Barbeque Grill. And, being a computer programmer, my hands are unused to physical labor...like using a screw driver!
Did you go to the Wal-Mart and then have to assemble that dang furniture they sell? lol
That's what my cause is anyway. Hands swelled during the night and were itchy the next morning.
Thanks for mentioning the Home Depot,
Michael in Houston