Detailed answer

A rash refers to a skin condition that is characterized by redness, itching, or changes in the texture or appearance of the skin. It can be caused by various factors such as allergic reactions, irritants, infections, or autoimmune conditions. On the other hand, a sexually transmitted infection (STI) is an infection caused by bacteria, viruses, or parasites that are transmitted through sexual contact, including vaginal, oral, or anal sex. STIs can manifest as rashes, but they can also cause other symptoms such as discharge, pain, sores, or flu-like symptoms. It is important to differentiate between a rash and an STI by seeking medical advice and getting tested if there is a possibility of exposure to an STI.