Re: Random weird goosebumps!!
Okay, this is simply a pilomotor reflex and can indeed arise as a consequence of anxiety which is significant enough to engage the fight-or-flight response. Realize that the pilomotor reflex, or goosebumps, arises most typically in humans as a response to fearful stimuli or apprehension of feeling unsafe. In humans, the forearms tend to demonstrate the pilomotor reflex most prominently, but can also be observed on the legs and scalp as well. The fact that it can be observed in patches has more to do with the body's overall response to the underlying cause.
While the response can be seen in some disorders, the hallmark characteristics otherwise would have to be present as well and in your specific instance, would not be applicable since no mention has been made of these other clinical signs that are far more pronounced than the appearance of the goosebumps.
You'll be fine.
Best regards,
Rutheford Rane, MD (ret.)
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Best regards and Good Health