Most common questions used to investigate
Are the bumps few in numbers?
are they painful?
Are they hard to the touch?
Are they painful?
Common conclusions
They are most likely harmless since there are various conditions that can cause this, such as keratin build-up under the skin called epidermal cyst or pilar cyst. The bump is usually hard, dome-shaped and skin-colored. If cosmetically not bothersome than it can be left untreated.
If they are soft to the touch and move slightly up with slight pressure, they are most likely harmless, fat-filled cyst under the skin. They are common for elder adults, found mostly in the neck or shoulder area. Keep a look out for any infection signs like itching, discharge or pain. If cosmetically not bothersome, it can be left untreated.
It may be some kind of mild head injury. After an injury bumps may appear and after some time some pain can be felt when touched. If it bothers too much, apply an ice pack otherwise, the pain will go away on its own.
It may or may not be filled with pus, but may look like white-headed pimples. It may be either bacterial or fungal infection near the roots of hair or maybe some kind of allergy because of hair care products. Avoid hot baths, shampoo and keep hair uncovered. Visit a doctor for further examination and for prescribed medication if necessary.
It may be newly growing hair follicles, sometimes they swell and turn slightly red and inwards turned hair can be seen. Once the hair comes out of the shaft, the condition will return to normal. This particularly happens after shaving the head.
References
https://www.healthline.com/health/bump-on-back-of-head#causes
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