Possible causes for red skin discoloration in the neck area include skin lesions, vitiligo, fungal infections, burns, infections, autoimmune diseases and allergies. Red skin discoloration may also be caused by heat, exposure to radiation and changes in hormone levels, as reported by the Medical Center of the University of Maryland.
Red skin discoloration on the neck may be accompanied by other symptoms. These include an itching sensation, blisters, scaly or flaky skin, red or discolored bumps or blotches and swelling. Seeing a dermatologist is the best way to determine the exact cause of red skin discoloration and receive the appropriate treatment.