Impetigo has two general forms: ordinary impetigo and bullous impetigo.
Ordinary impetigo is scabby and pustular (little pimples full of pus) in appearance and is generally caused by strep germs. It starts as a small blister or pustule that ruptures and leaves a reddish base which is then covered by a honey-colored crust. In children, this condition often begins on the skin near the nose, though it may spread. Ordinary impetigo is also known as impetigo vulgaris and streptococcal impetigo.
Bullous impetigo produces large, fragile blisters and is caused mostly by staph germs. It also often affects the face, but may appear elsewhere. The blisters it forms have very thin walls that collapse, leaving a bright red, inflamed, moist base. Bullous impetigo is also known as impetigo bullosa and staphylococcal impetigo