Piloerection — more commonly known as goosebumps …
We all get goosebumps.
But I have recemtly found out two things about this common phenomenon — one is general and the other seemingly specific to me.

Firstly piloerection (hairs standing up) is interesting because it is a demonstration of evolution not happening. We are all familiar with the cat with its fur fluffed out and tail bushed, usually when confronted with an aggressor. We’re all also familiar with the robin, or pigeon, fluffed up in the winter against the cold. Both these are the original uses of what we still have as goosebumps.
The way this works is that the tiny muscles around the hair follicles (or equivalent for feathers) react to cold or to adrenalin (produced in response to fear, or excitement). In contracting these tiny muscles pull the hair into a more erect state and cause the little bumps around the hair follicle. Humans have lost (most of) their fur, but we’ve not lost the response mechanisms to cold or which stimulate production of adrenalin. So we still get goosebumps, although they apparently confer no advantage on us. There is no cost, the reactions aren’t deleterious, so there has been no evolutionary pressure to remove the reaction. This is one of a number of traits which (some of) us exhibit and which are evolutionary remnants; others include our tails, widom teeth and appendix.
Like everyone I get goosebumps, and the tingling sensation of the skin that usually goes along with them. And, also like most, this is strongest on the forearms. But what I’ve noticed recently is that this is more marked on the right side of my body than the left. Sometimes it is only on my right side. Sometimes both sides but the right predominates. Whether it has always been like this I don’t know, but I think it probably has. I find this strange and I can neither find, nor conjure up, a satisfactory explanation. Does anyone have any clues?