← Skin Disorders – California Esthetician State Board Exam

California Esthetician State Board Exam Study Guide

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

28 cards covered

Skin Disorders – California Esthetician State Board Exam Study Guide


---


Overview


This study guide covers skin lesion identification, common skin conditions, and scope of practice guidelines essential for the California Esthetician State Board Exam. Estheticians must be able to recognize primary and secondary lesions, understand common skin disorders, and know when to refer clients to medical professionals. Understanding contraindications and the limits of your scope of practice is critical for both the exam and client safety.


---


Primary Lesions


Summary

Primary lesions are the initial, direct result of a disease or skin condition. They appear as original changes in the skin and are categorized by whether they are flat, raised, or fluid-filled.


Flat Lesions

  • • Macule – Flat, discolored spot; neither raised nor depressed; less than 1 cm

    • - Examples: Freckle, flat mole


    Solid Raised Lesions

  • • Papule – Small, solid, raised; less than 1 cm in diameter
  • • Nodule – Larger, deeper solid lesion; greater than 1 cm; extends into dermis or subcutaneous tissue
  • • Wheal – Raised, itchy, irregularly shaped; caused by allergic reaction or insect sting

    • - Example: Hives (urticaria)

  • • Comedone – Clogged hair follicle filled with sebum and dead skin cells

    • - Open comedone (blackhead): Exposed opening; dark color from oxidized melanin/sebum — not dirt

    - Closed comedone (whitehead): Covered by thin skin layer; white or flesh-colored


    Fluid-Filled Raised Lesions

  • • Vesicle – Fluid-filled; smaller than 0.5 cm

    • - Example: Blister from poison ivy

  • • Bulla – Fluid-filled; larger than 0.5 cm

    • - Example: Large blister from a burn

  • • Pustule – Raised lesion filled with pus; associated with acne and infected follicles

    • Key Terms

    | Term | Size | Contents |

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

    | Macule | < 1 cm | Flat (no elevation) |

    | Papule | < 1 cm | Solid |

    | Nodule | > 1 cm | Solid, deep |

    | Vesicle | < 0.5 cm | Fluid |

    | Bulla | > 0.5 cm | Fluid |

    | Pustule | Variable | Pus |

    | Wheal | Variable | Edema (localized) |


    > Watch Out For: The most commonly confused pairs on the exam are vesicle vs. bulla (size is the only difference) and papule vs. nodule (size AND depth differ). Memorize the 0.5 cm and 1 cm cutoffs.


    ---


    Secondary Lesions


    Summary

    Secondary lesions develop from primary lesions or result from external factors such as scratching, infection, healing, or chronic irritation. They represent changes to the skin over time.


    Types of Secondary Lesions


  • • Scale – Thin, dry flakes of dead epidermal cells shed from the skin surface

    • - Examples: Psoriasis, dry skin

  • • Fissure – Crack or linear break extending into the dermis; found on dry or inflamed skin

    • - Examples: Chapped lips, cracked heels

  • • Excoriation – Superficial abrasion caused by scratching or scraping; removes part of the epidermis
  • • Lichenification – Thickened, leathery skin with exaggerated skin markings from chronic scratching or rubbing

    • - Commonly associated with: Eczema

  • • Ulcer – Deep, open lesion extending through epidermis into the dermis or deeper; often scars upon healing

    • - Causes: Pressure, poor circulation, infection

  • • Keloid vs. Hypertrophic Scar:

    • - Both are raised scars from excess collagen production

    - Hypertrophic scar – Stays within the original wound margins

    - Keloid – Extends beyond the original wound; can continue to grow


    > Watch Out For: Keloid vs. hypertrophic scar is a frequent exam topic. Remember: Keloid = keeps growing and goes beyond the boundary. Both involve excess collagen, but only keloids "overstep" the wound borders.


    Key Terms

  • • Scale – Flaking dead skin
  • • Fissure – Crack into dermis
  • • Excoriation – Scratch/scrape abrasion
  • • Lichenification – Thick, leathery skin from chronic irritation
  • • Ulcer – Deep open wound
  • • Keloid – Overgrown scar beyond wound margins
  • • Hypertrophic scar – Raised scar within wound margins

    • ---


    Common Skin Conditions


    Acne Vulgaris

  • • Inflammatory condition affecting the pilosebaceous unit
  • • Four main causes (SKAI):

    • 1. Sebum overproduction

    2. Keratinization abnormality (clogged follicle)

    3. Acnes bacteria (Cutibacterium acnes) proliferation

    4. Inflammation


    Rosacea

  • • Chronic inflammatory condition causing:

    • - Facial redness

    - Visible blood vessels (telangiectasia)

    - Papules and pustules (in some cases)

  • • Common triggers: Heat, spicy foods, alcohol, sun exposure, harsh skincare products
  • • Esthetician note: Avoid stimulating treatments (steam, vigorous massage) during flare-ups

    • Eczema vs. Psoriasis


    | Feature | Eczema (Atopic Dermatitis) | Psoriasis |

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

    | Cause | Inflammatory; linked to allergies/sensitivities | Autoimmune |

    | Appearance | Itchy, red, dry skin | Thick, silvery scaly plaques |

    | Mechanism | Sensitivity reaction | Rapid skin cell turnover |

    | Treatment | Esthetician refers to MD | Esthetician refers to MD |


    Seborrheic Dermatitis

  • • Causes scaly patches, red skin, and stubborn dandruff
  • • Primarily affects oily areas: scalp, face, chest
  • • Associated with overgrowth of Malassezia yeast

    • Hyperpigmentation

  • • Definition: Darkening of skin from excess melanin production
  • • Three common causes:

    • 1. Sun exposure → Solar lentigines (sun spots)

    2. Hormonal changes → Melasma

    3. Post-inflammatory response → PIH (Post-Inflammatory Hyperpigmentation from acne or injury)


    Vitiligo

  • • Autoimmune condition
  • • Melanocytes are destroyed, resulting in smooth, white/light patches
  • • Can occur anywhere on the body
  • • No pigment in affected areas

    • Contact Dermatitis


    | Type | Cause | Mechanism |

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

    | Irritant Contact Dermatitis | Direct skin damage from a substance | No prior sensitization needed |

    | Allergic Contact Dermatitis | Immune-mediated reaction | Requires prior sensitization |


    Tinea Versicolor

  • • Fungal infection caused by overgrowth of Malassezia furfur yeast
  • • Results in patches of discolored, scaly skin (lighter or darker than surrounding skin)
  • • More noticeable after sun exposure

    • > Watch Out For: Both seborrheic dermatitis and tinea versicolor are associated with Malassezia yeast — but they are different conditions. Seborrheic dermatitis involves M. globosa/restricta; tinea versicolor involves M. furfur. Know both conditions and their distinct presentations.


    ---


    Skin Conditions & Assessment Tools


    The ABCDE Rule for Melanoma Detection


    Used by estheticians to identify warning signs and know when to refer to a physician.


    | Letter | Stands For | Warning Sign |

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

    | A | Asymmetry | Two halves don't match |

    | B | Border | Irregular, ragged, or blurred edges |

    | C | Color | Variation in color (brown, black, red, white) |

    | D | Diameter | Larger than 6 mm (size of a pencil eraser) |

    | E | Evolution | Any change in size, shape, color, or new symptom |


    > Important: Estheticians do not diagnose skin cancer. They use ABCDE to recognize when a referral to a physician or dermatologist is necessary.


    Sebaceous Cyst

  • • Closed sac beneath the skin filled with cheese-like sebum and epithelial cells
  • • Not contagious
  • • Estheticians must not manipulate it — risk of rupture and infection

    • ---


    Scope of Practice & Contraindications


    What California Estheticians CANNOT Do

  • • Diagnose, treat, or prescribe for any medical skin condition
  • • Perform services on contraindicated conditions
  • • Manipulate or extract sebaceous cysts, nodules, or suspicious lesions

    • Key Contraindications for Facial Services


    | Condition | Action |

    |---|---|

    | Active herpes simplex (cold sores) | Reschedule; do not perform service |

    | Impetigo (bacterial; highly contagious) | Refuse service; refer to physician immediately |

    | Psoriasis (active lesions) | Refer to dermatologist; no treatment without MD approval |

    | Suspected skin cancer | Refer to physician/dermatologist; document referral |

    | Active acne lesions (for massage) | Contraindicated; can spread infection |

    | Rosacea (in flare-up) | Avoid massage; can worsen inflammation |

    | Open wounds, sunburn, contagious conditions | Contraindicated for massage and most services |


    Facial Massage Contraindications

    Massage is contraindicated for:

  • • Active acne lesions
  • • Rosacea (during flare-up)
  • • Inflamed or sunburned skin
  • • Open wounds
  • • Contagious skin conditions
  • • Skin cancer

    • The Referral Protocol

    When a suspicious lesion is observed:

    1. Do not perform services on the affected area

    2. Refer the client to a licensed physician or dermatologist

    3. Document the referral in the client record


    > Watch Out For: The exam frequently tests whether an esthetician should "treat," "refer," or "reschedule." When in doubt — refer to a doctor. You cannot diagnose, and you cannot treat medical conditions. Always choose the answer that protects client safety and stays within scope of practice.


    ---


    Quick Review Checklist


    Use this checklist to confirm you are exam-ready:


  • • [ ] I can define and distinguish all primary lesions: macule, papule, nodule, vesicle, bulla, pustule, wheal, comedone
  • • [ ] I know the size cutoffs: vesicle < 0.5 cm, bulla > 0.5 cm, papule < 1 cm, nodule > 1 cm, melanoma concern > 6 mm
  • • [ ] I can define all secondary lesions: scale, fissure, excoriation, lichenification, ulcer, keloid, hypertrophic scar
  • • [ ] I know the difference between a keloid (extends beyond wound) and a hypertrophic scar (stays within wound)
  • • [ ] I can explain the four causes of acne vulgaris (SKAI)
  • • [ ] I understand rosacea triggers and why stimulating treatments are avoided
  • • [ ] I can differentiate eczema (inflammatory, allergy-linked) from psoriasis (autoimmune, scaly plaques)
  • • [ ] I know both types of contact dermatitis and their mechanisms
  • • [ ] I can explain three causes of hyperpigmentation (sun, hormones, post-inflammatory)
  • • [ ] I know the ABCDE rule for melanoma and can apply it to referral decisions
  • • [ ] I understand that impetigo and active herpes simplex are immediate contraindications
  • • [ ] I know facial massage contraindications and why each applies
  • • [ ] I understand that estheticians cannot diagnose, treat, or prescribe for any medical condition
  • • [ ] I know to refer and document when a suspicious lesion is identified
  • • [ ] I can distinguish an open comedone (blackhead = oxidized melanin, not dirt) from a closed comedone (whitehead = covered follicle)

    • ---


    Good luck on your California Esthetician State Board Exam! Prioritize memorizing size distinctions for lesions, contraindications, and referral protocols — these are high-frequency exam topics.

    📝

    Take a Practice Test

    Test yourself with multiple choice questions
    📇

    Study with Flashcards

    Flip through all 28 cards

    Want more study tools?

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

    View Pricing