Stung by a wasp yesterday. My finger was numb so I took an antihistamine and put cold water on it. This morning my finger is swollen, red and hot.

It is normal for swelling and redness to occur after an insect bite. You should continue taking anti-histamines and applying cold compresses to the affected area. If the swelling persists or worsens, if the redness spreads, or if you develop a fever, it is important to seek medical advice. Infection of the skin is a potential complication of insect bites, so it's important to monitor for any signs of infection in the coming days. If you are concerned about the swelling of your finger, it is advisable to seek professional help.