This is just a theory (do not kill me
), but do you ladies think that there is such little evidence because it is caused primarily to women with tight curls (women of African descent). I would think a scalp with straight hair having a growth spurt would not "hurt" as much as a scalp with tight curls having a growth spurt. For example, a condition called pseudofolliculitis barbae (razor bumps) happens more likely to men of African descent because of their tight curls.
"Pseudofolliculitis barbae (razor bumps) is a common condition of the beard area occurring in African American men and other people with curly hair. The problem results when highly curved hairs grow back into the skin causing inflammation and a foreign body reaction. Over time, this can cause keloidal scarring which looks like hard bumps of the beard area and neck."
***Now I am not saying the soreness on our heads is razor bumps, but it could be another condition similar to razor bumps due to tight curls. Our non-African descending counterparts may not experience this condition.