Similar to skin prick testing, the suspected allergy-causing medication is placed on the arm in the form of a droplet and a puncture to the skin in the made. Concentrations of the medication are increased and several skin pricks are performed. If no reaction takes place, we then do intradermal testing, once again with incremental dosages of the medication that is suspected to cause the allergy. This is when the medication is injected just below the skin and we observe to see if there is a reaction. This is done in a safe environment.