Impetigo is a skin infection commonly caused by the bacteria Staphylococcus Aureus and Streptococcus Pyogenes. It is contagious can spread via skin to skin contact. It may complicate eczema or insect bites. It presents as yellow crust on the skin. It should be treated with antibiotics. In some patients, the bacteria are carried in their noses and it is important to apply antibiotic cream to the insides of the nose to eradicate the bacteria.