Lumps inside the nose are nasal polyps. During an allergic reaction or infection, the moist layer inside the nose swells and reddens, sometimes forming a round lump called a polyp. These polyps often hinder breathing by blocking nasal passages, according to Healthline.
Everyone is susceptible to polyp development, but people who suffer from asthma, hay fever, chronic sinus infections, sensitivity to NSAIDs, cystic fibrosis or Churg-Strauss syndrome are especially vulnerable. Heredity may play a role in the tendency to develop nasal polyps based on the way genes influence reactions to nasal inflammation. Anti-inflammatory medications and sprayed or injectable steroids are the most common treatment options, as stated by Healthline.