There are several synonyms for the term "plague spots" that refer to infectious skin conditions. Some of these synonyms include pustules, lesions, abscesses, sores, blisters, eruptions, blemishes, welts, and ulcers. These skin conditions can be caused by a variety of factors, including bacteria, viruses, fungi, and parasites. They can also be a symptom of a larger underlying health condition. The term "plague spots" specifically refers to the characteristic skin lesions associated with the bubonic plague, which is caused by the bacterium Yersinia pestis. However, these synonyms can be used to describe a wide range of skin conditions with similar appearances.