Need to take ENT examination as early as possible.
It could be vestibulitis, it needs to address on time
Next Steps
for immediate pain relief, can take paracetamol 650mg thrice , if you r not allergic to it.
need of oral antibiotics
can apply antibiotic ointment (neosporin H) at affected area in nostril
Health Tips
kindly consult ENT surgeon for better evaluation n management