There are three forms of impetigo:
Ordinary Impetigo is caused by Streptococcal germs. It appears as red sores that rupture quickly, ooze a fluid and then form a honey-colored crust. It primarily affects children from infancy to age two.
Bulbous Impetigo appears as fluid-filled blisters caused by Staphylococcus germs. This contagious infection is carried by the fluid that oozes from the blisters.
Ecthyma, a more serious form of impetigo that penetrates to the second layer of skin (dermis). It is characterized by sores that are painful and/or fluid or pus-filled. These lesions most commonly appear on the legs or feet. The sores break open and scab with a hard yellow-gray crust. It can also cause swollen lymph glands in the affected area.
Impetigo is generally treated with a seven-to-10-day course of prescription oral antibiotics and/or topical antibiotics. The sores tend to heal slowly, so it is important to complete the full course of medications. Please note that over-the-counter topical antibiotics (such as Neosporin) are not effective for treating impetigo.