A keloid is a type of scar, that continues to grow and often itch, well after the underlying wound has healed.
Acne keloidalis is a type of scarring reaction most often seen on the nape of the neck or scalp. Acne keloidalis may develop after a ‘close shave’ where the hairs have a chance to ingrow and cause inflammation and then scar.
Here’s a good case report:
Acne keloidalis nuchae: clinical and dermoscopic features
, , , BMJ Case Reports 2017:published online 23 September 2017, doi:10.1136/bcr-2017-222222
Note: Content is Not intended as medical advice. Please consult your health care provider regarding your specific medical condition and questions.