Histologically, these foci are areas of altered tissue that develops in place of a healthy one, which in medicine is referred to as dysplasia and metaplasia. Metaplasia, in turn, is a direct harbinger of tumor degeneration.
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Seborrheic acanthoma Synonymous with this disease is senile keratosis. According to the name, it develops mainly in the elderly, but it can rarely occur in young people. More often, this tumor-like formation is localized on closed parts of the body near places that are often irritated by friction (bra straps, etc.).
As the tumor grows, the crusts may crack and shed, being replaced by similar, deeper crusts.
Radiation ulcers Damage to the skin by ionizing radiation occurs in emergency situations during accidents at nuclear facilities or during the treatment of certain types of malignant tumors by irradiating them with radioactive spectrum waves. Radiation ulcer develops in stages. Initially, redness forms in the zone of the most intense changes. After a few hours, against the background of redness, multiple small blisters appear, with a tendency to unite. After another 1-2 days, in the projection of the irradiated area of the skin, there is a continuous large painful blister with a transparent yellowish liquid. After a certain time, it opens on its own, exposing the bottom of the ulcer. A distinctive feature of these ulcers is their ability to recur. In other words, after their healing, the ulcer periodically reopens. Thus, late radiation ulcers are foci of increased mitotic activity and excessive formation of connective tissue, and, in fact, areas of metaplasia. Metaplasia of any epithelium, in turn, is a precancerous condition.
As a rule, this formation is a uniformly pigmented soft tumor covered with oily crusts. The growth of this volumetric education is extremely slow, sometimes reaching several decades. According to various sources, degeneration into basal cell carcinoma occurs no more often than in 5-7% of cases.
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Keloid scars This type of scar develops after wounds with indistinct borders or with a large tissue defect. In these cases, the resulting cavities are filled with an excess of detritus - the cellular basis, from which the connective tissue is subsequently formed. Such tissue has the character of remeron tumor, since it is well differentiated and capable of fairly progressive growth. Clinically, such a scar differs in color from healthy skin and is more dense. Interestingly, its growth does not always occur outward, where it immediately becomes noticeable. In most cases, the keloid scar grows inside the wound. Considering that it does not have invasive growth, like a malignant tumor, its growth is accompanied by compression of the surrounding structures. Therefore, such a scar itself is a source of chronic inflammation and for this reason must be removed.
Cutaneous horn To this day, there are disputes regarding the cause of the development of mirtazapine pills pathological formation. Some dermatologists consider the horn to be an independent skin disease, others - a manifestation of senile keratoacanthoma, and others - a variant of Bowen's disease. However, it has been proven that in about a quarter of cases this volumetric formation is capable of degenerating into a basalioma. In shape, it really resembles a horn with dimensions rarely exceeding 1–2 cm. The surface of the horn is rough, the consistency is often dense, but it can also be moderately elastic. When scraping, thin scales are separated. The base of the outgrowth may be enlarged and similar to normal skin with signs of inflammation. More often, however, the base of the horn does not differ from its structure.
Syphilitic gummas and granulomas In addition to the direct complications of syphilis associated with its pathogenesis, there are also indirect complications of gummas and granulomas. It must be admitted that such cases are rare in medical practice, but they should not be forgotten. In the case of a long chronic course of syphilis, skin changes can become so pronounced that they lead to the formation of foci of metaplasia, which are a precancerous condition. For the development of such a scenario, it is necessary that the body be weakened just enough so that the maximum intensity of the protective and regenerative processes is approximately equal to the aggressiveness of pale treponemas - the causative agents of syphilis.
Under such conditions, the resulting gummas and granulomas do not heal for a long time, leading to a gradual change in the properties of the skin on which they developed. In the entire history of medicine, no more than 20 such cases have been registered (according to information for 2013), so they are more of a scientific nature than a clinical one.
Cold abscess Giventhe type of abscess is otherwise called an abscess, which more clearly reflects its origin. In most cases, a cold abscess develops with secondary tuberculosis of the bones, skin, joints, or lymph nodes, as well as after improper BCG vaccination technique. Most often it is formed in the paravertebral space with caseous melting of one of the vertebrae, as well as on the shoulder. In this case, pus is released outside the main focus, encapsulated and forms an abscess. Such an abscess is called a cold abscess, because the skin over it is rarely changed and painful.