I wondered what exactly causes this? For example when I look at clusters of holes (trypophpbia) or nasty mold I have a feeling like my skin is crawling, it’s almost itchy.
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[Formication](https://www.verywellhealth.com/skin-crawling-formication-5323977) is a tactile hallucination associated with certain brain disorders and drug recovery.
You might just mean [goose bumps](https://www.healthline.com/health/goosebumps-on-skin#how-they-develop). Those pop up whenever you’re cold, emotional, or even pooping. From the article:
“Goosebumps may also occur during times of physical exertion, even for small activities, like when you’re having a bowel movement. This is because the physical exertion activates your sympathetic, or instinctual, nervous system. Sometimes, goosebumps may crop up for no reason at all.“
I think goosebumps while pooping is a byproduct, but pretty much all other times goosebumps pop up is when you might need to look bigger than you actually are.
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