How dare you inject intelligent scientific information into a thread based upon rumor and speculation?
My guess: Chances are it's a reaction to something in the laundry detergent or softener. The neck is rubbed by the collar of the garment all day long, while the clothing tends to be flat against the torso.
Try a hypo-allergenic detergent, but do not eschew the wine.
Going to a dermatologist or allergist is not irrational. (Dermatology is a great specialty. There are hundreds of conditions and two or three creams)