I have what feels like a cold no sorethroat nor fever a day ago a itchy localized rash on my chest came thats slightly risen red spots. What is this?

Doctor can evaluate. Rashes can be hard to figure out without looking at them. Cold symptoms can be seen with colds, strep throat, flu, allergies, etc... A rash can happen sometimes if a person's body is reacting to the germ causing the cold symptoms (sort of like an allergic reaction). Strep throat bacteria can make a toxin that causes reddish rashes. Over-the-counter antihistamines may decrease rashes and itching.

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