Detailed answer

A rash is a broad term used to describe any visible changes on the skin such as redness, itching, bumps, or blisters. It can be caused by various factors including irritation, infection, or an underlying medical condition. On the other hand, an allergic reaction is a specific response of the immune system to an allergen. When a person with allergies comes into contact with a substance they are allergic to, the immune system reacts by releasing histamines, which can lead to a skin rash among other symptoms. Allergic reactions are typically characterized by itching, redness, swelling, and sometimes hives or welts. It is important to identify the cause of a rash or allergic reaction in order to determine the appropriate treatment and avoid further exposure to potential allergens.