Can razor bumps cause acne keloidalis nuchae?

Razor bumps, also called pseudofolliculitis barbae, happen when cut hairs curve back into the skin and trigger inflammation. Acne keloidalis nuchae is a longer-lasting inflammatory condition that commonly begins as small itchy or tender bumps along the back of the scalp or neck. Repeated close shaving, clipping, scratching or rubbing collars can keep follicles inflamed and may lead to firm raised scars. Razor bumps and acne keloidalis nuchae are related but are not interchangeable diagnoses.

Avoid a very close shave while bumps are active, and consider leaving hair slightly longer. If shaving, soften hair first, use a clean sharp tool, shave in the direction of growth and avoid repeated strokes. Do not pick, squeeze or scratch the bumps, and reduce friction from tight collars or helmets. A dermatologist may prescribe anti-inflammatory or antibacterial treatment, recommend hair-removal changes, or discuss procedures for established raised scars. Treatment works best when new bumps are prevented as well as existing inflammation addressed.

Get medical advice when bumps recur in the same neck area, become firm, form a band of raised scars, or leave hair loss. Seek prompt care for rapidly spreading redness, pus, severe pain, fever or a tender swelling. Early assessment can help distinguish acne keloidalis nuchae from infection, ordinary folliculitis or another scalp condition and may limit further scarring.

Are these ordinary razor bumps, acne keloidalis nuchae or another follicle condition? What shaving length and tool should I use? How can early raised scars or persistent itch be treated?