Can spit infect your ear piercing?

Possibly: Any bacteria in an open wound may cause an infection.

YES: Check for signs of infection: ^'ed redness, warmth, swelling. ^'ed tenderness, pus, red streaking, swollen lymph nodes or fever. Recommend keeping piercing in place unless directed by Dr (if removed – drainage tract will close up w ^'ed risk of abscess formation). Call Dr for medical evaluation. Your Dr may prescribe oral antibiotics or antibiotic ointments to apply to piercing site.

Yes: Te human mouth contains a lot of bacteria which can get a piercing infected.