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All squamous cell carcinoma lesions are thought to begin via the repeated, uncontrolled division of cancer stem cells of epithelial lineage or characteristics. Accumulation of these cancer cells causes a microscopic focus of abnormal cells that are, at least initially, locally confined within the specific tissue in which the progenitor cell resided.
Fibrous papule of the nose is a harmless small bump on or near the nose. It is typically dome-shaped, skin-colored, white or reddish, smooth and firm. [1] [2] Less frequently it can occur elsewhere on the face. [3] Sometimes there are a few. [1] It may be shiny and remains unchanged for life. There may be a central hair. [3] The precise cause ...
What it looks like: Rosacea causes redness and thick skin on the face, usually clustered in the center. Easy flushing, a stinging sensation, and small, pus-filled pimples are other common signs of ...
Surgery to remove the basal-cell carcinoma affected area and the surrounding skin is thought to be the most effective treatment. [40] A disadvantage with standard surgical excision is a reported higher recurrence rate of basal-cell cancers of the face, [ 41 ] especially around the eyelids, [ 42 ] nose, and facial structures. [ 43 ]
Keratoacanthoma is commonly found on sun-exposed skin, often face, forearms and hands. [2] [3] It is rarely found at a mucocutaneous junction or on mucous membranes. [2] Keratoacanthoma may be difficult to distinguish visually from a skin cancer. [4] Under the microscope, keratoacanthoma very closely resembles squamous cell carcinoma. In order ...
Seborrheic dermatitis is a skin condition that causes inflamed, scaly patches of skin on the scalp and face, the American Academy of Dermatology explains. These patches are typically itchy, red ...
This rash was known as erythema chronicum migrans, the skin rash found in early-stage Lyme disease. [ 18 ] In the 1920s, French physicians Garin and Bujadoux described a patient with meningoencephalitis, painful sensory radiculitis, and erythema migrans following a tick bite, and they postulated the symptoms were due to a spirochetal infection.
Pinta, the least severe of treponemal infections being limited to the skin, is thought to be transmitted by skin-to-skin contact (similar to bejel and yaws), and after an incubation period of two to three weeks, produces a raised papule, which enlarges and becomes hyperkeratotic (scaly/flaky). Lesions are usually present in the exposed surface ...