How does impetigo look in adults?

Impetigo appears as red sores that eventually turn into blisters and open up, according to WebMD. The blisters often ooze and form a crusty coating. The crust usually appears as a yellowish-brown color, states Mayo Clinic.

The size of the sores caused by impetigo vary from a small pimple size to a large coin size, notes WebMD. The spots tend to increase in size, with more sores appearing as the infection progresses. The impetigo sores are not usually painful but are sometimes itchy.

The sores caused by impetigo typically start near the mouth and nose, says Mayo Clinic. The infection spreads to other parts of the body through contact with hands, clothes or towels.