That's always a little disconcerting when we can see our pulse! There is something called bounding pulse. You may be able to see your pulse because of a thin layer of skin there, no fat to cover it, etc. But you also might have bounding pulse. https://www.medicalnewstoday.com/articles/322460.php Lots of things causes it like anxiety, stress, fever, dehydration, hormonal imbalance, certain medications, allergic reactions, etc. It would be a good idea just to check in with a doctor if this continues.