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"Do I have a sudden rash on my neck?"

It is possible that the sudden eruption on your neck could be due to an allergy or something else. If the situation does not improve within 48 to 72 hours, it would be a good idea to visit a pharmacy to show the lesions to a pharmacist who can assess the situation and recommend a treatment plan for you. In the meantime, it is recommended to only apply a fragrance-free moisturizer like Aveeno.