A skin lesion is a general term for a single, small area of skin disease. The lesions can be single or multiple. Terms used to describe these lesions include macules, papules, plaques, nodules, vesicles, pustules, erosions, and ulcers. Some authorities divide these injuries into primary and secondary types.

The rash
The term rash is collectively used to describe the presence of many lesions. Lesions containing a rash may be isolated or at least partially merge. The term eruption is, for practical purposes, a synonym.

Spot
The macula is an area of discoloration 1.5 cm or less in diameter. Such a lesion has no significant substance on palpation. For this reason, the macules never noticeably increase, although they may be slightly depressed. Such depressive lesions are called atrophic maculae.

The patch
A patch is an intangible area of color change measuring more than 1.5 cm in diameter. Patches otherwise have the same attributes as maculae. Patches can occur as such, develop due to the enlargement of one macula, or develop due to the fusion of the growth of several neighboring maculae.

Daddy
A papule is a small, noticeable lesion 1.5 cm or less in diameter. Some papules exist deep in the skin, where they are clearly visible, but do not rise noticeably above the level of the surrounding skin.

Plaque
The plaque is a flat-topped, palpable lesion measuring more than 1.5 cm in diameter. It can be represented as a papule that has increased in two dimensions: length and width. Most plaques are raised, but as for papules, those that are located deep inside the skin may appear even with or even depressed below the level of the surrounding skin. Plaques can occur as such, develop due to a planar enlargement of one papule, or develop due to the fusion of the growth of several neighboring papules.

The nodule
A nodule is a papule that is spherically enlarged in three dimensions-length, width, and depth. Nodules usually have a diameter of 1.5 cm or more. A cyst is a nodule with a central cavity. The term tumor, because of its connotation as a neoplasm, should be avoided as a synonym for nodule.

Vesicle
A vesicle is a fluid-filled papule in which fluid is macroscopically localized. Simply put, a vesicle is a small blister and, by definition, has a diameter of 1.5 cm or less. The liquid contained inside the bubble is initially transparent, but with age, the liquid often becomes slightly cloudy.

A pustule is a vesicle containing numerous neutrophils. Pustules should be enlarged from cloudy bubbles. Pustules are white or yellow-white from their onset, whereas vesicles that are clear at the beginning become cloudy (but never truly white) as they accumulate white blood cells during aging. Pustules do not necessarily have to indicate the presence of an infection.

Vesicles of all types are fragile. When the top of the vesicle is damaged or missing, the presenting lesion is a shallow erosion rather than an intact blister. The withdrawal of such erosion from the previous blister is due to the perfectly round shape and the presence of a peripheral collar of scale, which are fragments of the remaining, devitalized roof of the blister.

The Bull
A bulla is a bubble measuring more than 1.5 cm in diameter. Bulloses, which are isolated in the form of single large blisters, are one-eyed and rounded. Bullae, which develop due to the fusion of several small vesicles, are usually multilocular and often have an irregular configuration.

Erosion
Erosion occurs when the lesion is connected to the overlying epithelium. Since the epithelial layer is thin, the erosion is noticeably quite shallow. Depending on the rate at which the liquid flows out, either the erosion will have a wet red base, or the base will be covered with a crust. Erosion occurs as a result of two mechanisms: spontaneous destruction of the overlying roof of a blister or disruption of the non-vesicular epithelium caused by a traumatic event.

A crack is a very thin, linear erosion that develops as a result of excessive drying (xerosis) of the epithelium. Cracks can have either a non-inflammatory base (cracking) or a red inflammatory base (xerotic eczema).

The ulcer
An ulcer is a skin defect deeper than an erosion. Not only the superficial epithelium is missing, but also various degrees of skin damage. The ulcer may have a moist red base, but a crust is usually present. The crust is often black and adhesive as a result of the presence of red blood cells and fibrin. Ulcers do not heal as a result of the separation of blisters. They usually occur when the vascular flow to the skin is disrupted. This disorder can be caused by compression of the vessel (erupting ulcers), narrowing of the lumen (vasculitis, thrombosis or embolism) or tissue growth that outstrips its blood supply (ulceration of tumors). plinko καζίνο
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