An encapsulated sac located below the upper layers of skin that is normally filled with either fluid, semi-solid matter, or gas.

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Infections of the skin can result in different types of skin lesions, including:
- Crust
- Cyst
- Macule
- Papule
- Pustule
- Ulcer
- Vesicle
- Wheal
- Abscess
- Bulla
- Carbuncle
- Folliculitis
- Furuncle (boil)
- Pseudocyst
- Purulent
- Pyoderma
- Suppurative

Types of Skin Lesions

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Dried fluids from a lesion on the surface of the skin

Crust

Cyst

Smooth spots of discoloration on the skin

Macules

Small raised bumps on the skin that are not filled with liquid.

Papules

Bumps on the skin that are filled with either fluid or pus.

Pustules

Ulcers

Vesicle

Inflamed or swollen skin that burns or itches.

Wheal

Abscess

Fluid-filled blister no more than 5 mm in diameter.

Bulla

Deep, pus-filled abscess generally formed from multiple furuncles.

Carbuncle

A localized rash due to inflammation of hair follicles.

Folliculitis

Pus-filled abscess due to infection of a hair follicle.

Furuncle (boil)

Lesion that resembles a cyst but with a less defined boundary.

Pseudocyst

Purulent

Any suppurative (pus-producing) infection of the skin.

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