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n. pl. gum·mas or gum·ma·ta (gŭm′ə-tə)
A small rubbery granuloma that has a necrotic center and is enclosed by an inflamed fibrous capsule. It is characteristic of an advanced stage of syphilis.

[New Latin, from Late Latin, gum; see gum1.]

gum′ma·tous adj.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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There are 4 types of central nervous system involvement caused by syphilis: Syphilitic meningitis, meningovascular syphilis, parenchymal syphilis and gummatous syphilis.
The tertiary stage is subdivided into three general categories: gummatous syphilis, followed by cardiovascular syphilis and finally neurosyphilis.[sup][3] In particular, tertiary syphilis often mimics cancer, because it frequently presents as a space-occupying lesion in visceral organs.[sup][3],[4]
Gummatous mucocutaneous lesions of tertiary syphilis and advanced secondary syphilis can be seen simultaneously [4].
The cardinal manifestations of this late form of syphilis are cardiovascular, gummatous and neurosyphilis.