Pustule
Historical document, translated for reference. It reflects medical knowledge of the 1920s–30s and is not medical advice.
Summary
This article from the 1928–1936 Soviet Great Medical Encyclopedia defines the pustule as a morphological skin lesion containing pus. It classifies pustules into superficial forms that heal without scarring and deep forms that leave scars upon healing.
Encyclopedia entry (1928–1936)
PUSTULE (pustule, pustula), a morphological element of skin rashes, representing a blister with purulent contents. A pustule arises either immediately as such or secondarily from a vesicle (see Vesicula) due to the penetration of pyogenic bacteria through its roof. A distinction is made between 1) superficial pustules, i.e., those localized within the thickness of the epidermis, which dry up and turn into crusts that fall off without leaving a scar (see Impetigo), and 2) deep pustules, i.e., those localized in the corium, upon the healing of which a scar remains. Pustula maligna—see Anthrax.
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“Pustule.” Soviet Medical Encyclopedia. English translation of Bolshaya Meditsinskaya Entsiklopediya, 1st ed. (Moscow, 1928–1936), ed. N. A. Semashko. https://sovietmedicalencyclopedia.pages.dev/article/pustule/