nonbullous impetigo

the most common kind of impetigo, caused by infection at sites of minor trauma such as scrapes, cuts, or insect bites; the infecting organism is usually Staphylococcus aureus and less often a group A streptococcus. The characteristic lesions are discrete fragile vesicles that have erythematous borders and later become pustular, rupture, and discharge a thin yellow seropurulent fluid that dries and forms a thick crust. The pustules may spread peripherally with central healing, evolving into annular, circinate, or gyrate patterns. Called also i. vulgaris.

Nonbullous impetigo.