At the moment i have a very red, blotchy neck although mines was just caused by wash wipes that i have taken an allergic reaction too.. it is probably something you have used on your neck for example, perfume or lotion or maybe its just from sun exposure. any of these options are quite likely.
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Clogged pores can cause non itchy welts on the neck, chest, and back. These are called blemishes or pimples.