Ifepidermal cells are rejected, an erosive chancre is formed; if connective tissue is
also rejected, ulcerative chancre is formed.
Clinical characteristics of solid chancre
- Defect up to 0.5-1 cm in diameter.
-
A round or oval shape, depending on the anatomical and physiological
characteristics of the affected skin. For example, in the corners of the mouth and in
the folds of the anus the shape of the chancre is oblong, and in the coronary groove
of the penis and at the nipples of the breast it looks like a crescent moon.
- Saucer-shaped edges. There are never undercut or sheer edges.
This plays a
certain diagnostic role.
- The bottom is flat, shiny, as if varnished. The color
of the solid chancre is red,
often compared with the color of fresh meat in the section. Sometimes the chancre
acquires a gray color, resembling a spoiled fat.
- The basis of the solid chancre is compaction (induction) - cartilage compaction,
which is a pathognomonic symptom.
- The skin around the chancre is usually without signs of inflammation.
- The solid chancre is painless! This is due to the
fact that Treponema palidum
secretes anesthetics that affect the Schwanian membranes of nerve endings.
- With the usual development of erosive hard chancre, a pigmented spot remains,
after an ulcerative - a star scar.
Atypical chancres present great difficulties for the diagnosis of syphilis.
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