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The Greek word exánthēma, which can be translated as "efflorescence" , came to late Latin as exanthēma, which in our language resulted in exanthema . The term is used in the field of medicine to name a type of acne .

The rash usually appears next to a heating of the skin . This rash of reddish hue, when pressed with a finger, disappears momentarily. Diseases such as chickenpox and the measles They are characterized by the rash.

The rashes, therefore, are clinical signs of certain diseases . Its quantity and its distribution in the body vary according to each case. The rash usually appears from an infection or an allergic reaction.

The maculo-papular rashes They are the most common. They consist of papules (injuries with an elevation) and macules (lesions that are flat) that can have different shapes. The purpuric rashes (with ecchymosis, petechiae and bruises) and vesicular rashes (with blisters and vesicles) are other kinds of rashes.

Chickenpox, for example, is caused by virus varicella zoster . This disease has a latency period of two to three weeks before manifesting itself with a similar picture to the flu. Its development continues with the rash, whose papules become vesicles and later on scabs. These lesions can cause permanent scars depending on their evolution and the wounds that the patient self-generates if scratched.

As for the measles , this viral disease has an incubation of between four and twelve days. Then the rash appears with a generalized rash throughout the body.

Sudden rash

It is known as sudden rash, sixth disease or children's roseola to a disease that arises from a virus in children between 4 months and 2 years of age, although it can occur at other ages. The means of transmission They are saliva and blood. Skin lesions are seen in the form of pink or red dots that turn white when pressed. At first, they appear on the trunk and neck, but then extend to the extremities and face.

Despite certain similarities in symptoms, sudden rash should not be confused with scarlet fever, measles and rubella, three other rash diseases. In cases of drug hypersensitivity, a reaction Similary.

With respect to the most common cause, this is usually the human herpes virus 6 , but may also appear as a result of 7 . Within 6 two types are recognized: the TO and the B , the latter being the one that accompanies 99% of cases of sudden rash. This disease has a period of incubation which goes from 5 to 15 days and, usually, the reservoir of the virus that causes it is an adult who has been in contact with him.

It is common for patients with sudden rash to go through a fever high that appears without apparent cause, and that lasts between two and three days. It is only when they recover the normal body temperature that small pink pimples are noticed, which gradually cover a larger surface of the skin. The rash itself does not usually exceed two days.

Although it does not usually occur, it is possible that certain complications arise from this infection. The most common is a picture of febrile seizures that occurs in the phase prior to the appearance of the rash. It is worth mentioning that seizures are not usually serious and that in some patients they occur as a direct result of a central nervous system involvement. In people who have compromised their immune system, on the other hand, it is normal for cases of hepatitis and encephalitis to arise.

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