The skin of the human being is the covering of the outer surface of the body which is the largest organ of the human system as well as which has multiple layer of ectodermic tissue. A coetaneous condition is any medical condition that affects the integument system the organ system that comprises the entire surface of the body and includes skin, hair, nails, and related muscle and glands. The major function of this system is as a barrier against the external environment. Conditions of the human integument system constitute a broad spectrum of diseases, also known as dermatomes, as well as many no pathologic states (like, in certain circumstances, melanonychia and racquet nails) While only a small number of skin diseases account for most visits to the physician, thousands of skin conditions have been described. Classification of these conditions often presents many ontological challenges, since underlying etiologies and pathogenesis are often not known. Therefore, most current textbooks present a classification based on location (for example, conditions of the mucous membrane), morphology (chronic blistering conditions), etiology (skin conditions resulting from physical factors), and so on. Clinically, the diagnosis of any particular skin condition is made by gathering pertinent information regarding the presenting skin lesion(s), including the location (such as arms, head, legs), symptoms (prorates, pain), duration (acute or chronic), arrangement (solitary, generalized, annular, linear), morphology (macula, papules, vesicles), and color (red, blue, brown, black, white, yellow). The diagnosis of many conditions often also requires a skin biopsy which yields histological information that can be correlated with the clinical presentation and any laboratory data.The physical assessment of the skin and its appendage, as well as the mucous membranes, forms the keystone of an accurate diagnosis of cutaneous conditions. Most of these conditions present with coetaneous exterior changes termed "lesions," which have more or less distinct uniqueness. regularly proper assessment will lead the doctor to obtain appropriate historical information and/or laboratory tests that are able to confirm the diagnosis. Upon examination, the vital clinical explanation are the (1) morphology, (2) configuration, and (3) distribution of the lesion With regard to morphology, the initial lesion that characterizes a condition is known as the "primary lesion," and identification of such a lesions is the most important aspect of the coetaneous examination. Over time, these key lesions may keep on to extend or be made to order by regression or trauma, producing "minor lesions." on the other hand, with that being stated, the lack of standardization of basic dermatologic expressions has been one of the main barriers to successful statement among physician in describing coetaneous findings. yet, there are some normally established terms used to depict the macroscopic morphology, pattern, and sharing of skin lesion, which are listed below.
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