← Skin & Scalp – Illinois Cosmetology State Board Exam

Illinois Cosmetology State Board Exam Study Guide

Key concepts, definitions, and exam tips organized by topic.

25 cards covered

Skin & Scalp – Illinois Cosmetology State Board Exam Study Guide


---


Overview


This study guide covers the essential skin and scalp content tested on the Illinois Cosmetology State Board Exam. You will need to understand skin anatomy, physiology, common disorders, scalp conditions, and professional service protocols. Mastery of these topics ensures both exam success and safe, professional client care.


---


Skin Structure & Layers


The Two Main Layers of Skin


The skin is the largest organ of the body and is organized into distinct layers, each with specialized functions.


  • • Epidermis – The outer, protective layer; contains no blood vessels; nourished by diffusion from the dermis
  • • Dermis – The deeper, thicker layer; contains blood vessels, nerves, hair follicles, and glands
  • • Subcutaneous layer (hypodermis) – Beneath the dermis; composed of fat and connective tissue; provides insulation and cushioning

    • ---


    Layers of the Epidermis (Deep to Superficial)


    | Layer | Also Known As | Key Function |

    |---|---|---|

    | Stratum germinativum | Stratum basale / Basal layer | Cell production via mitosis; contains melanocytes |

    | Stratum spinosum | Spiny layer | Provides structural support |

    | Stratum granulosum | Granular layer | Begins keratinization process |

    | Stratum lucidum | Clear layer | Found only on palms and soles |

    | Stratum corneum | Horny layer | Dead, keratinized cells; continuous shedding |


    > Memory Tip: From deep to superficial — Girls Should Get Laid Comfortably (Germinativum, Spinosum, Granulosum, Lucidum, Corneum)


    ---


    The Dermis


    The dermis contains two sublayers:


  • • Papillary layer (upper) – Contains capillaries, nerve endings, and dermal papillae that connect to the epidermis
  • • Reticular layer (lower) – Contains collagen and elastin fibers that give skin strength and elasticity; also houses hair follicles and glands

    • ---


    Skin Glands


    #### Sebaceous Glands (Oil Glands)

  • • Secrete sebum – an oily substance that lubricates skin and hair
  • • Connected to hair follicles
  • • Overproduction → acne; underproduction → dry, tight skin

    • #### Sweat Glands

  • • Eccrine glands – Found all over the body; regulate body temperature through perspiration
  • • Apocrine glands – Found in the underarm and groin; activated by emotion or stress; associated with body odor

    • ---


    Melanin & Skin Color


  • • Melanin – The pigment that gives skin, hair, and eyes their color
  • • Produced by melanocytes located in the stratum germinativum
  • • More melanin = darker skin tone; less melanin = lighter skin tone
  • • Melanin also provides some protection against UV radiation

    • ---


    Key Terms – Skin Structure


  • • Epidermis – Outermost skin layer
  • • Dermis – Inner, thicker skin layer
  • • Stratum germinativum – Deepest epidermal layer; cell reproduction
  • • Stratum corneum – Outermost epidermal layer; dead cells
  • • Melanocytes – Melanin-producing cells
  • • Sebaceous glands – Oil glands; produce sebum
  • • Eccrine glands – Sweat glands; temperature regulation
  • • Apocrine glands – Sweat glands; stress/emotion activated
  • • Collagen – Protein that gives skin firmness
  • • Elastin – Protein that gives skin elasticity

    • ---


    > ### ⚠️ Watch Out For

    > - The stratum corneum is the outermost layer; stratum germinativum is the deepest — do not confuse the two

    > - Melanin is produced in the basal layer, not the stratum corneum

    > - The dermis contains blood vessels; the epidermis does NOT

    > - Sebaceous glands produce sebum (oil) — not sweat


    ---


    Skin Functions & Properties


    The Six Primary Functions of Skin


    Use the acronym PSHESA to remember:


    | Letter | Function | Description |

    |---|---|---|

    | P | Protection | Barrier against bacteria, chemicals, and physical damage |

    | S | Sensation | Detects touch, pain, heat, and pressure via nerve endings |

    | H | Heat regulation | Controls body temperature through sweating and blood flow |

    | E | Excretion | Eliminates waste products through perspiration |

    | S | Secretion | Produces sebum to lubricate and protect skin and hair |

    | A | Absorption | Allows limited absorption of certain substances |


    ---


    Skin pH & The Acid Mantle


  • • Normal skin pH: approximately 4.5 to 5.5 (slightly acidic)
  • • Acid mantle – A thin, protective film on the skin's surface formed by a combination of sebum and sweat

    • - Protects against bacteria, viruses, and environmental damage

    - Disrupted by harsh cleansers, over-exfoliation, or high-pH products

    - Products with pH higher than 5.5 can disrupt the mantle; those with pH closer to skin's pH support barrier integrity


    ---


    Transepidermal Water Loss (TEWL)


  • • TEWL – The process by which water evaporates from the skin through the epidermis
  • • Excessive TEWL leads to:

    • - Dry, dehydrated skin

    - Compromised skin barrier

    - Increased sensitivity and irritation

  • • A healthy acid mantle and moisturizers help reduce TEWL

    • ---


    Key Terms – Skin Functions & Properties


  • • Acid mantle – Protective film of sebum and sweat on the skin surface
  • • pH – Measure of acidity/alkalinity (skin = 4.5–5.5)
  • • TEWL – Transepidermal water loss; water evaporation through skin
  • • Keratin – Protective protein in the outer skin layer and hair

    • ---


    > ### ⚠️ Watch Out For

    > - Skin pH is acidic (4.5–5.5), NOT neutral (7.0) — this is a frequent exam question

    > - The acid mantle is formed by both sebum AND sweat, not just one

    > - TEWL increases when the skin barrier is compromised, not when it is healthy


    ---


    Skin Disorders & Conditions


    Primary vs. Secondary Lesions


    | Type | Definition | Examples |

    |---|---|---|

    | Primary lesion | Initial skin change from disease or injury | Macule, papule, vesicle, pustule, wheal |

    | Secondary lesion | Develops from a primary lesion due to infection, scratching, or healing | Crust, scar, ulcer, scale, fissure |


    ---


    Common Primary Lesions


    | Lesion | Description | Example |

    |---|---|---|

    | Macule | Flat, discolored spot; <1 cm; not raised | Freckle, flat mole |

    | Papule | Small, raised, solid bump; <1 cm | Raised pimple |

    | Vesicle | Small blister filled with clear fluid | Herpes simplex (cold sore blister) |

    | Pustule | Raised lesion filled with pus | Acne pimple |

    | Wheal | Raised, itchy bump from fluid in dermis | Hive (urticaria) |

    | Nodule | Solid, raised lesion; larger and deeper than papule | Cystic acne nodule |


    ---


    Common Secondary Lesions


    | Lesion | Description |

    |---|---|

    | Crust | Dried serum, blood, or pus on surface |

    | Scale | Flaking dead skin cells |

    | Scar | Fibrous tissue replacing normal skin after healing |

    | Ulcer | Open sore with loss of skin surface |

    | Fissure | Crack or linear break in the skin |

    | Excoriation | Abrasion caused by scratching |


    ---


    Pigmentation Disorders


  • • Hyperpigmentation – Abnormal darkening of the skin due to excess melanin

    • - Causes: sun exposure, hormonal changes (melasma), inflammation, injury

    - Examples: melasma, age spots (lentigines), post-inflammatory hyperpigmentation

  • • Hypopigmentation – Lack of melanin resulting in lighter patches

    • - Example: vitiligo (autoimmune destruction of melanocytes)

  • • Albinism – Congenital absence of melanin

    • ---


    Acne Vulgaris


  • • Definition: A chronic inflammatory skin condition involving overproduction of sebum and clogging of hair follicles
  • • Gland involved: Sebaceous glands
  • • Types of acne lesions:

    • - Comedone – Clogged follicle (open = blackhead; closed = whitehead)

    - Papule – Inflamed, raised bump

    - Pustule – Pus-filled raised lesion

    - Cyst/Nodule – Deep, painful, severe lesion


    ---


    Comedone vs. Milia


    | Feature | Comedone | Milia |

    |---|---|---|

    | Cause | Clogged hair follicle with sebum and dead cells | Trapped keratin beneath skin surface |

    | Involves hair follicle? | Yes | No |

    | Appearance | Open (black) or closed (white) plugged pore | Small, pearly white cysts |

    | Treatment | Extractions, salicylic acid | Manual extraction by esthetician |


    ---


    Rosacea


  • • Characteristics: Chronic facial redness, visible blood vessels (telangiectasia), sometimes pustules
  • • Primarily affects: Nose, cheeks, forehead, chin
  • • Triggers: Heat, spicy food, alcohol, sun exposure, stress
  • • Cosmetologist's role: Use gentle, non-irritating products; avoid harsh scrubs; no services that cause excessive heat or redness

    • ---


    Key Terms – Skin Disorders


  • • Macule – Flat, discolored spot (e.g., freckle)
  • • Papule – Small, raised, solid bump
  • • Vesicle – Small fluid-filled blister
  • • Pustule – Pus-filled raised lesion
  • • Comedone – Clogged hair follicle (blackhead/whitehead)
  • • Milia – Trapped keratin cysts; not follicle-related
  • • Hyperpigmentation – Excess melanin/darkening
  • • Rosacea – Chronic facial redness and visible capillaries
  • • Acne vulgaris – Chronic inflammatory condition; sebaceous glands involved

    • ---


    > ### ⚠️ Watch Out For

    > - Milia are NOT comedones — they do not involve the hair follicle

    > - Rosacea is NOT acne, though it can have pustules — do not use acne treatments on rosacea clients without guidance

    > - A macule is FLAT — if it's raised, it's something else (papule, nodule, etc.)

    > - A blackhead is an open comedone (oxidized sebum); a whitehead is a closed comedone


    ---


    Scalp Conditions & Disorders


    Dandruff (Pityriasis Capitis)


  • • Technical name: Pityriasis capitis
  • • Cause: Associated with the yeast-like fungus Malassezia (also called Pityrosporum)
  • • Characteristics: Excessive shedding of dead scalp skin cells; white or gray dry flakes
  • • Is it contagious? Generally considered non-contagious
  • • Treatment: Anti-dandruff shampoos containing zinc pyrithione, selenium sulfide, or ketoconazole

    • ---


    Seborrheic Dermatitis vs. Simple Dandruff


    | Feature | Simple Dandruff | Seborrheic Dermatitis |

    |---|---|---|

    | Flake type | Dry, white, loose flakes | Greasy, yellowish, adherent scales |

    | Inflammation | No | Yes – redness present |

    | Location | Scalp primarily | Scalp, face (eyebrows, nose), chest |

    | Severity | Mild | More severe; chronic inflammatory condition |


    ---


    Tinea Capitis (Ringworm of the Scalp)


  • • Type: Contagious fungal infection of the scalp
  • • Common name: Ringworm of the scalp
  • • Signs: Circular, scaly bald patches; broken hair shafts; itching
  • • Cosmetologist's action: DO NOT provide services — refer client to a physician immediately
  • • Important: Despite its name, ringworm is caused by a fungus, NOT a worm

    • ---


    Pediculosis Capitis (Head Lice)


  • • Type: Parasitic infestation by head lice (Pediculus humanus capitis)
  • • Signs to look for:

    • - Intense itching of the scalp

    - Visible lice (small, grayish insects)

    - Nits – Tiny white or grayish eggs attached to the hair shaft close to the scalp

  • • Cosmetologist's action: DO NOT provide services — it is highly contagious; refer client to a physician

    • ---


    Alopecia (Hair Loss)


    | Type | Description |

    |---|---|

    | Alopecia areata | Autoimmune; patchy, sudden hair loss; smooth, round bald patches |

    | Alopecia totalis | Complete loss of all scalp hair |

    | Alopecia universalis | Complete loss of all body hair |

    | Androgenetic alopecia | Hereditary hair thinning/loss (male or female pattern baldness) |

    | Traction alopecia | Hair loss caused by prolonged tension on hair follicles |


    ---


    Key Terms – Scalp Conditions


  • • Pityriasis capitis – Technical name for dandruff
  • • Malassezia – Yeast-like fungus associated with dandruff
  • • Seborrheic dermatitis – Chronic inflammatory scalp/skin condition; greasy, yellowish scales
  • • Tinea capitis – Contagious fungal infection of the scalp; no services
  • • Pediculosis capitis – Head lice infestation; no services
  • • Nits – Lice eggs attached to hair shaft
  • • Alopecia areata – Autoimmune patchy hair loss
  • • Traction alopecia – Hair loss from tension/pulling

    • ---


    > ### ⚠️ Watch Out For

    > - Tinea capitis and pediculosis capitis are both contraindications for cosmetology services — always refer to a physician

    > - Ringworm is a fungal infection, NOT caused by a worm — the name is misleading

    > - Nits are attached to the hair shaft — they do not brush off easily (unlike dandruff flakes)

    > - Alopecia areata is autoimmune — it is not caused by poor scalp care or fungal infection


    ---


    Scalp & Skin Care Procedures


    Scalp Massage


    Two types of massage manipulations used in cosmetology:


    | Manipulation | Description | Purpose |

    |---|---|---|

    | Effleurage | Light, gentle, gliding strokes | Relaxation; begins and ends massage; promotes circulation |

    | Petrissage | Kneading and lifting movements | Deeper stimulation; promotes sebum distribution; relaxes muscles |


    Benefits of scalp massage:

  • • Stimulates blood circulation to the scalp
  • • Relaxes muscles and reduces tension
  • • Promotes distribution of sebum
  • • Supports overall scalp health

    • ---


    When to Avoid Scalp Massage


    A cosmetologist must NOT perform scalp massage when the client has:

  • • Inflamed, infected, or irritated scalp conditions
  • • Open sores or lesions on the scalp
  • • Contagious scalp conditions (tinea capitis,
    • 📝

    Take a Practice Test

    Test yourself with multiple choice questions
    📇

    Study with Flashcards

    Flip through all 25 cards

    Want more study tools?

    Subscribe for $7.99/mo and turn your own notes into personalized flashcards and study guides.

    View Pricing