How can you remove a wasp stinger after it has been embedded for a day?

Stinger. Remove stinger by scraping along edge of skin with a credit card. Clean area with soap ; warm water. Apply ice in 10 minute increments; alternating 10 on ; 10 off. Try a bag of cold peas. You can take meds like tylenol, (acetaminophen) Aspirin or Motrin for pain or Benadryl for swelling. Make a paste of 2 parts baking soda ; 1 part water ; apply. By the way, usually bees leave a stinger.