The researchers explained that picking the nose is a completely natural habit. Children who have not yet learned social norms begin to stick their fingers in their noses at a very early age. The nose produces mucus, an important biological filter for trapping dust, allergens and pathogens. For example, Staphylococcus aureus, which can cause various infections, is often found in the nose.
This is where the danger of collecting lies. It may be associated with an increased risk of infecting wounds, where Staphylococcus aureus poses the greatest threat. Nose picking can also promote pneumococcal transmission (streptococcal pneumonia), causes of pneumonia.
In other words, sticking your finger up your nose is a great way to drive pathogens deep into your body or spread them around you. Therefore, it is useful to be careful: Wash your hands before and after this work.