Deep creases at the back of the head can be caused by several factors, including genetics, aging, and prolonged pressure on the area from sleeping positions or tight hairstyles. Muscle tension and changes in skin elasticity over time may also contribute. In some cases, these creases can be more pronounced in individuals with certain health conditions or habits that affect skin health. Consulting a dermatologist can provide insights tailored to individual circumstances.
Cracked head/ head gasket or driving through deep water.
Sex
Sneezing. look it up....
To what? The charger? In the back kind of were the DSi "creases". The head phones plug in on the skinny side below the start and select button. BE MORE SPECIFIC!!!
Many things from Acne to rubbing of a wetsuit
Yes
A crackling noise when you turn your head or press on the back of the neck - like rice krispies - is called Crepitus.
Sometimes your brain gets a bit distressed and it cases you pain
Work your fingers in deep, circular motions, going back and forth from the front to the back of the head.
Flatness on the parietal bone at the back of the head can be caused by factors such as genetics, positional preferences during infancy, or pressure from lying on a particular surface for extended periods. It is typically a benign condition and usually resolves as a child grows and changes positions more frequently.
There are a number of possible causes for feeling pressure at the back of the head. They include tension headaches, migraines, headaches originating from the neck area, and inflamed sinuses.
There may be many causes of pain in lower part on back of the head those can be broadly divided into Skeletal, Neurological, Neoplastic, Infective and miscellaneous. One of the most common causes seen in middle aged/elderly population is cervical spondylosis. Pain coming from facet joints (small flat joints located in back portion of vertebra) from upper cervical (neck) vertebrae may be referred to back of head. Irritation of upper cervical nerve roots from prolapsed disc, tumors is known to be felt in back of head. Atlantoaxial instability (joint between first two neck vertebrae) has been proposed as a cause of vague back of the head and neck pain due to altered biomechanics. Posterior fossa tumors of the brain located in the back portion of the skull are included as neoplastic (cancer) causes. To conclude, local superficial infections of skin and subcutaneous tissues and inflammation of the lymph nodes would be some other more obvious causes.