Exanthematous virus diseases give rise to skin rashes, and most of them lead to other added symptoms too. The majority of the viruses in this classification are extremely communicable.

Examples of exanthematous virus diseases are:

Rubella
Smallpox
Chikungunya virus infection
Roseola
Measles
Fifth disease
Clinical Manifestation

Pink-to-red spots or bumps on the trunk, legs, and arms
A rash may be itchy
Fatigue
Fever
Loss of appetite
Pain
Irritability
Transmission

These viruses transmit through the droplets from the sneeze or cough of an infected person.
Virus diseases like smallpox and chickenpox spread when a person comes into contact with fluid in broken derm lesions.
People suffering from chickenpox develop shingles eventually as it is a regeneration of the virus 'varicella- zoster' that has been resting in the body's cell.
Chikungunya virus transmitted via mosquito bite is a non-communicable disease that cannot be spread from one person to another.
Treatment

Treatment of these diseases targets managing the clinical manifestation. Medications like acetaminophen help to reduce fever and some other distressing symptoms.

The person having chickenpox or shingles infections is recommended to take antivirals medications like acyclovir.

Prevention

Vaccines for measles, chickenpox, smallpox, and shingles are available. The risk of developing chikungunya virus infection can be prevented by protecting against mosquito bites.

Conclusion
There are several virus diseases, such as stomach flu or the common cold, that are minor and go away on their own in a few days only. However, some are very serious.

Basically, virus diseases don't respond to antibiotics, and their treatment generally focuses on the management of their clinical manifestation. One can support their immune system by taking proper rest and sleep, maintaining good hygiene, taking a balanced diet, and keeping the body hydrated.