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 alongside a heating of the skin. This reddish rash, when pressed with a finger, disappears momentarily. Diseases such as chickenpox and the measles are characterized by rash.
Rash, therefore, are clinical signs of certain diseases. Its quantity and its distribution in the body vary according to each case. The rash is usually caused by an infection or an allergic reaction.
The maculopapular rashes they are the most common. They are made up of papules (injury with an elevation) and macules (lesions that are flat) that can have various shapes. The purpuric rashes (with ecchymosis, petechiae and bruises) and the vesicular rashes (with blisters and vesicles) are other classes of rashes.
Chickenpox, for example, is caused by virus varicella zoster. This disease has a latency period of between two and three weeks before manifesting with a flu-like picture. Its development continues with the rash, the papules of which turn into vesicles and later into scabs. These injuries can lead to permanent scars depending on their evolution and the wounds that the patient generates if they scratch.
Regarding the measles, this viral disease has an incubation of between four and twelve days. Then the rash appears with a generalized rash all over the body.
It is known as sudden rash, sixth disease or child 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. On the skin there are lesions shaped like pink or red dots that turn white when pressed. Initially, they appear on the trunk and neck, but later they spread to the extremities and face.
Despite some similarities in symptoms, the sudden rash should not be confused with scarlet fever, measles, and rubella, three other exanthematic diseases. In cases of hypersensitivity to drugs, a reaction Similary.
With respect to the most common cause, this is usually the human herpes virus 6, but it can 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 that goes from 5 to 15 days and, in general, the reservoir of the virus that causes it is an adult who has been in contact with it.
It is common for patients with a sudden rash to go through a fever discharge that appears without apparent cause, and that lasts between two and three days. It is only when they regain normal body temperature that the small pink pimples are noticed, which little by little cover a greater surface of the skin. The rash itself usually does not 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 should be mentioned that seizures are not usually serious and that in some patients they occur as a direct result of central nervous system involvement. In people whose immune system is compromised, on the other hand, it is normal for cases of hepatitis and encephalitis to appear.