Tuberculosis cutis - rather extensive and various on the displays group of dermatoses, occurrence and which development it is caused by penetration into a skin and a hypodermic fat of tubercular micobacteria. Almost in all cases the tubercular lesion of a skin is secondary and endogenous. The originator usually gets in a skin and a hypodermic fat from the centers of a tuberculosis in other organs, sometimes the infection gets into a skin on an extent - from the amazed next organs; very seldom there is an exogenous becoming infected of a skin - through its damages.

Vulgar (ordinary, tubercular) the lupus arises usually at school age from occurrence of the several fine flesh-coloured flat soft eminences which are finding out at a diascopy translucent yellowness (a phenomenon of " apple jelly »), and at pressing by a bellied probe - extreme softness and vulnerability (a phenomenon of "probe"). Gradually lipomas are enlarged in sizes and number, can become covered by flakes, become ulcers. After an adhesion of ulcers or resorptions of lipomas remain the thin smooth white atrophic cicatrixes reminding the crumpled tissue paper.

The scrofuloderma is observed mainly at children and the teenagers, hypodermic lymph nodes suffering by a tuberculosis from which process passes to a hypodermic fatty tissue; the becoming infected can occur and hematogenic by. In submandibular area, on a neck, breasts, extremities arise individual or plural is cyanotic-red units with the subsequent central ramollissement and formation of deep soft, almost painless ulcers with the hanging edges, bridged among themselves in depth fistulose courses.

The warty tuberculosis cutis arises at an exogenous becoming infected of a skin, is frequent in connection with a trade. Usually on fingers of arms or a back of the hand the small painless infiltrate of is cyanotic-red color with warty growths Pa the surfaces, subsequently exposed to a cicatrization is formed.

The ulcerative tuberculosis cutis is observed at sharply weakened patients with active tubercular process in lungs, an intestine, kidneys. The lesion of a skin results from an autoinoculation a sputum, a feces or the urine, containing tubercular micobacteria. On mucosas and a skin natural foramens have small soft painless ulcers with hanging edges and rough bottom, with the smallest abscesses.

The papulonecrotic tuberculosis cutis arises at young age in the form of small is cyanotic-red nodules with a necrotic scab in the center after which atrophy there are cicatrixes. Rashes symmetrize, mainly on extremities and breeches. Subjective sensations are absent. Current of process recurring.