A rash is a change of the skin The skin is the outer covering of the body. In humans, it is the largest organ of the integumentary system made up of multiple layers of ectodermal tissue, and guards the underlying muscles, bones, ligaments and internal organs. Human skin is not unlike that of most other mammals except that it is not protected by a pelt and appears hairless which affects its color, appearance or texture Texture refers to the properties held and sensations caused by the external surface of objects received through the sense of touch. Texture is sometimes used to describe the feel of non-tactile sensations. Texture can also be termed as a pattern that has been scaled down where the individual elements that go on to make the pattern not. A rash may be localized in one part of the body, or affect all the skin. Rashes may cause the skin to change color, itch Itch is an unpleasant sensation that evokes the desire or reflex to scratch. Itch has resisted many attempts to classify it as any one type of sensory experience. Modern science has shown that itch has many similarities to pain, and while both are unpleasant sensory experiences, their behavioral response patterns are different. Pain creates a, become warm, bumpy, dry, cracked or blistered A blister is a small pocket of fluid within the upper layers of the skin, typically caused by forceful rubbing , burning, freezing, chemical exposure or infection. Most blisters are filled with a clear fluid called serum or plasma (aka, "blister water"). However, blisters can be filled with blood (known as blood blisters) or with pus (if, swell and may be painful. The causes, and therefore treatments for rashes, vary widely. Diagnosis must take into account such things as the appearance of the rash, other symptoms, what the patient may have been exposed to, occupation, and occurrence in family members. The diagnosis may confirm any number of conditions.
The presence of a rash may aid associated signs and symptoms are diagnostic of certain diseases. For example, the rash in measles is an erythematous Erythema is redness of the skin, caused by congestion of the capillaries in the lower layers of the skin. It occurs with any skin injury, infection, or inflammation, maculopapular A maculopapular rash is a medical term used to describe a unique type of rash. It is a compound of the terms macule and papule (bumps). It is usually also described as erythematous, or red rash that begins a few days after the fever starts. It classically starts at the head and spreads downwards.
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