I can barely see a bit of swelling on the foot on the right side as we look at the photo.
The chick may have worked a splinter from wood shavings, if that's what you use for bedding, into the pad. It's not yet infected, but if left alone, it could fester and a staph infection could ensue..
The best course of action is a very warm, hot, but not hot enough that it burns your hand, Epsom salt soak. You need to keep the foot submerged for a good 15 to 20 minutes. Dry the foot and run you finger nail across the swollen spot several times to dislodge any foreign body.
Vetericyn spray or gel is the best wound treatment. But antibiotic ointment will do fine.
Keep an eye on the foot and if the swelling and redness persists, repeat the above treatment each day until the swelling disappears.