The appearance of lumps and bumps on the skin behind the neck, along hairlines, is quite common. They may be caused by skin irritation, muscle knots, acne, boils, and cysts.
Certain substances found in some products turn them into irritants when they regularly come in contact with neck hairline skin. Such products include hair-care products, clothing detergent, shampoo, and sweat. Also, hair and clothes cause friction to the back of the neck, and when irritation occurs, that can lead to lumps and bumps as well as other types of skin problems.
We will be taking you through some of the most common reasons people have lumps and bumps on the hairline at the back of their necks. We will also include when to seek medical attention.
Swollen lymph nodes
Lymph nodes can swell due to infection
As a part of the immune system, the lymph system features a web of lymph vessels and nodes. With the help of lymph nodes, the body can do away with germs and get rid of destructive substances found in the fluid along the vessels of lymph according to medicalnewstoday.com