Malignant pustule sounds more like smallpox than anthrax.
FYI ping.
Nope, "malignant pustule" is a traditional descriptive term for anthrax. It usually starts as a single pustule (smallpox is very plural) on the skin that ulcerates, doesn't hurt, but causes widespread problems because of the toxins it spews out. One pustule can potentially kill, thus is "malignant," although the mortality of cutaneous disease is low. It's worse if you inhale or inject it, but most cases, even in the 2001 attacks, were limited to the skin.
ThesaurusLegend: Synonyms Related Words Antonyms
Noun 1. malignant pustule - a form of anthrax infection that begins as papule that becomes a vesicle and breaks with a discharge of toxins; symptoms of septicemia are severe with vomiting and high fever and profuse sweating; the infection is often fatal cutaneous anthrax
anthrax - a disease of humans that is not communicable; caused by infection with Bacillus anthracis followed by septicemia