We are all used to coping with insect stings in open air in spring, summer and autumn. Usually, reactions are mild with an itching rash which goes away quickly. But if skin reactions after a Bee, Wasp or Hornet sting last more than 24-48 hours and are wider than 10 cm, they could be a red flag for allergic sensitization. Asking you to answer a simple questionnaire, we would like to seek possible cases of allergic sensitization and give some advice on how to address this issue with an allergist. @puntonelvivo