K.Z.
When my child was about the same age he had a splinter in his finger. It bacamed infected. I had him soak his hand using a tub of warm soapy water and some soap. I sat him on my lap at the table, and dropped some toys in the water for him to reach for. He splashed and played for 5-10 minutes, 4 times a day or so until the infection healed. Just be careful. If the redness area grows he should see the doctor. Infections can spread quickly.