There are a few reasons why Melissa McCarthy covers up her neck. One reason is that she is self-conscious about her appearance. She has said in interviews that she doesn't like how she looks in photos and that she feels more comfortable when her neck is covered. Another reason is that McCarthy suffers from rosacea, which is a skin condition that causes redness and inflammation. Covering her neck helps to reduce the visibility of her rosacea flare-ups. Finally, McCarthy has also said that she simply prefers to keep her neck covered for personal reasons.