You're suffering from a condition called vitiligo. Yea you are right VITILIGO

Research have shown that most skin problem occur as a result of defective healing of the burn,piercing of the skin(i.e ear lobe,nose),other causes are shaving against the direction of the hair,family history ( hereditary) any type of skin wound/ puncture can induce the body to overproduce the extra collagen.SOLUTION: when you discover rash/ bumps at the back of your head,best thing is not to touch/ handle at the early stage.avoid piercing,surgery and other form of self medication requiring incision of the skin would/can make the keloid,bumps,wart etc recur even bigger than the initial size.the best solution is to avoid or prevent and if not please contact a specialist.you can also send questions to this mail Deeteebumps@yahoo.com for free consult.

Razor bumps can be so irritating. However one must study his skin before choosing the most suitable mode of shaving. Clipper is the best method when it comes to shaving having it in mind that you must follow the direction of the hair(dont shave against the direction of the hair). Whichever method one chooses to use,be sure that it's suitable to your skin.i think knowing your type of skin is the most important thing here

Keloid re the overgrowth of scar tissue dat occur mostly on the chest,shoulder or any part of the body.can also develop on the earlobes from ear piercing. Bumps is a disorder of the skin also known as shave bumps.appears mostly around the beard area of the neck,face and back of the head.the approach on getting solution for either bumps/keloid can be different i.e like using cream or after shave liquid (anti bumps) for rashes/after shave rashes.whichever approach one chooses,the best option is to consult a specialist to avoid causing more havoc.for instant solution to all skin issue you can learn more on Deeteebumps.com.waiting to respond to question from fellow nairalander