According to the study published in the journal "Cell", patients with eczema, healthy bacteria and the oils that protect them are eliminated, allowing harmful bacteria to spread. This includes Staphylococcus aureus, which is usually found on the skin or in the nose and is usually harmless and may cause skin infections, food poisoning and bacteremia.The scientists experimented on mice by introducing Staphylococcus aureus, causing severe itching that worsened over several days and led to skin damage.The scientists said that an enzyme called "V8", works like molecular scissors, cuts part of the protein "PAR1" that lines nerve cells in the skin, which leads to PAR1 triggers a signal through skin neurons and even the brain, hence the desire to itch.Scientists plan to test whether other bacteria can lead to itching in patients with skin conditions.