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Surface Change : Crust

hardened layer that results when serum, blood, or purulent exudate dries on the skin surface. Crusts may be thin or thick and can have varying color.

Crusts are yellow-brown when formed from serum, green or yellow-green when formed from purulent exudate, or red-black when formed by blood.

Thick brown crusted plaques and erosions in a child with impetiginized atopic dermatitis

Thick brown crusted plaques and erosions in a child with impetiginized atopic dermatitis

Lip mucosal hemorrhagic crust in herpes simplex virus

Lip mucosal hemorrhagic crust in herpes simplex virus

Crust and exudative weeping in impetigo

Crust and exudative weeping in impetigo

Adherent honey-colored crust in impetigo

Adherent honey-colored crust in impetigo