While you won't actually be able to see the effects, what does happen, is this swelling can create a tingling sensation or itch which the liar will want to scratch, and as a result, they end up touching their nose.
你是不會看到這樣的變化,而是這種腫脹會讓說謊者產生刺痛感或感到發癢以致會想抓,所以他們會有抓鼻子的動作。