Question 179: What is the ruling on shaving the hair of the neck? Is it considered part of the beard?
Answer: The hair that grows on the neck is not considered part of the beard and thus it is permissible for you to shave it. It is worth mentioning that the part of the beard whose shaving is Haraam (prohibited) is the hair which grows on the cheeks and chin. And Allaah knows best… read more here.