Hi !

Here are some ideas of a couple of people sharing the same symptoms and I think this will give you somewhere to start. Definitely see a doctor as it might be a serious medical condition or becoming one right now. Read here: Sharp needles like pain on skin. - Infectious diseases - Condition | Our Health

“I don't know about sharp needles necessarily but i had these same symptoms several years ago, seemingly incurable itching especially when i would sweat. I went to my doctor several times before he suggested changing my laundry detergent. I switched brands and washed all my clothes and haven't experienced any itching since. Seems like whenever i would sweat from activity or nervousness it would dissolve whatever i was allergic to into the sweat and subsequently onto my skin.”