I pulled a hangnail from my toe and now it's swollen and stings. what should i do to treat it?

See a podiatrist: You have created an infection that needs professional care. You can soak your toe in warm salt water and apply an antibiotic until you see your podiatrist.

Soak in warm water : And epsom salt, then apply a topical antibiotic (bacitracin, triple antibiotic ointment.) do this twice a day. If it does not get better after a day or 2 see a doctor for an oral antibiotic. (best to see a podiatrist as more of the nail may have to be removed.).