The plague doctor has an interesting history and has become an increasingly popular tattoo design in recent years. The plague doctor was a medical professional in the Middle Ages who was hired to treat victims of the plague. The plague was a deadly and highly contagious disease that affected millions in Europe during the 14th century. The plague doctor would wear a protective suit to avoid catching the disease, and the suit would usually include a long coat and a beak-like mask with a long, pointed nose. The mask was filled with herbs and spices to try to protect the doctor from the germs.