What is a viral rash & how do I get rid of one? Causing red itchy bumps in random places that come & go. Doc said side effect of post-viral bronchitis

Antihistamines. Good morning, viral rashes could vary in nature from macules and papules due to chicken pox and mononucleosis to hives, which can last for a long time. Red itchy bumps suggest hives. Viruses come to our body, enter the cells of different types and take over the management of the affected cells just like a new manager. Our immune system reacts by antibodies to reject them, and will eliminate them.