Detailed answer

A rash refers to any noticeable change in the skin's color, texture, or appearance. It can be caused by various factors such as allergies, irritants, medications, or skin conditions like eczema. Rashes are typically localized and affect only the skin. On the other hand, a viral infection is caused by a virus that enters the body and affects its internal organs or systems. Viral infections can result in a wide range of symptoms, including fever, body aches, fatigue, and specific patterns of rashes. Unlike rashes, viral infections are systemic and can spread throughout the body. Additionally, viral infections often present with other symptoms beyond skin irritation, such as respiratory, gastrointestinal, or neurological symptoms, depending on the specific virus involved.