Dried fluids from a lesion on the surface of the skin

Crust

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

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.

Pyoderma

Suppurative

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

University of Southern Mississippi

Austin Community College

Skin & Eye

https://openstax.org/details/books/microbiology/

Microbiology covers the scope and sequence requirements for a single-semester microbiology course for non-majors. The book presents the core concepts of microbiology with a focus on applications for careers in allied health. The pedagogical features of the text make the material interesting and accessible while maintaining the career-application focus and scientific rigor inherent in the subject matter. Microbiology’s art program enhances students’ understanding of concepts through clear and effective illustrations, diagrams, and photographs.

Microbiology is produced through a collaborative publishing agreement between OpenStax and the American Society for Microbiology Press. The book aligns with the curriculum guidelines of the American Society for Microbiology.

OpenStax Microbiology Textbook

The skin is made up of three different layers: 
- Epidermis
- Dermis
- Hypodermis.

Layers of the Skin

Bacterial Infections of the Skin and Eyes

Viral Infections of the Skin and Eyes

Fungal Infections of the Skin and eyes (Mycoses)

There is a variety of parasitic protozoans and helminths use the skin or eyes as their main portal of entry by physically burrowing into the skin or the mucosa to breach the skin barrier if there is a break in the skin it makes it easier for parasitic entry.

Protozoan and Helminthic Infections of the Skin and Eyes

Some microorganisms live on the skin and use sweat and sebum as a source of nutrition. These microbes often secrete antimicrobials to try and prevent other organisms from colonizing and infecting the skin.

Normal Microbiota of the Skin

The eye is in direct contact with the environment, making it susceptible to infection. To prevent infection, the following anatomy of the eye are important: 
- Nasolacrimal drainage system
- Conjunctiva

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