← Skin Conditions – California Esthetician State Board Exam

California Esthetician State Board Exam Study Guide

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

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Skin Conditions – California Esthetician State Board Exam Study Guide


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Overview


This study guide covers the essential skin conditions tested on the California Esthetician State Board Exam. You will need to recognize, describe, and differentiate primary and secondary lesions, acne types, pigmentation disorders, inflammatory and infectious conditions, and skin cancers. Understanding the esthetician's scope of practice — including when to refer clients to a physician — is critical throughout every category.


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Primary & Secondary Lesions


Overview

Lesions are classified as primary (arising from previously normal skin) or secondary (resulting from changes to primary lesions over time). Recognizing lesion types is foundational to identifying contraindications and determining appropriate treatments.


Primary Lesions


| Lesion | Description | Key Example |

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

| Macule | Flat, non-palpable, discolored spot | Freckle, flat birthmark |

| Papule | Small, raised, solid bump < 0.5 cm | Mole, wart |

| Vesicle | Small, raised, clear fluid-filled sac | Chickenpox blister |

| Bulla | Large fluid-filled blister > 0.5 cm | Burn blister |

| Pustule | Raised, pus-filled lesion | Acne pimple |

| Wheal | Raised, itchy, transient, irregular border | Hives (urticaria) |


Secondary Lesions


| Lesion | Description | Key Example |

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

| Scale | Thin plates of dead, dried epidermal cells | Psoriasis, dandruff |

| Fissure | Deep linear crack extending into the dermis | Cracked heels, chapped lips |

| Excoriation | Superficial wound from scratching or scraping | Scratch marks |

| Crust | Dried serum, blood, or pus on skin surface | Scabbed wound |


Key Terms

  • • Primary lesion – Develops on previously healthy, unaffected skin
  • • Secondary lesion – Results from changes to or manipulation of a primary lesion
  • • Serous fluid – Clear, watery fluid found in vesicles and bullae
  • • Palpable – Can be felt by touch; raised lesions are palpable; macules are not

    • Watch Out For

    > ⚠️ Vesicle vs. Pustule: Both are raised and fluid-filled, but a vesicle contains clear serous fluid while a pustule contains pus (infected fluid). The board exam frequently tests this distinction.

    >

    > ⚠️ Macule vs. Papule: A macule is flat; a papule is raised. The prefix mac- can remind you of a flat surface.


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    Acne & Sebaceous Disorders


    Overview

    Acne vulgaris is one of the most common conditions estheticians treat. Understanding grades of acne, comedone types, and related sebaceous disorders determines which treatments are appropriate and which require physician referral.


    Types of Comedones

  • • Closed comedo (whitehead): Follicle sealed under skin with trapped sebum and dead cells; no air exposure
  • • Open comedo (blackhead): Follicle opening exposed to air; dark color results from oxidation, not dirt

    • Acne Grading


    | Grade | Description |

    |---|---|

    | Grade I | Mostly non-inflamed comedones; minimal papules |

    | Grade II | Comedones with some papules and pustules |

    | Grade III | Many papules and pustules; inflamed; redness |

    | Grade IV (Cystic) | Deep, painful nodules and cysts; high scarring risk |


    > ✅ Estheticians can treat Grade I and II acne. Grade III and IV typically require referral to a dermatologist.


    Related Sebaceous Conditions


  • • Milia: Small, white, keratin-filled cysts trapped beneath the skin; found most often around the eyes and cheeks; not caused by bacteria
  • • Sebaceous hyperplasia: Enlarged sebaceous glands appearing as yellowish, donut-shaped bumps; common in middle-aged adults; benign
  • • Rosacea: Chronic inflammatory condition with central facial redness, visible vessels, and sometimes papules; often mistaken for acne; aggravated by heat, spicy food, alcohol, and UV exposure

    • Key Terms

  • • Sebum – Oil produced by sebaceous glands
  • • Comedone – Clogged hair follicle filled with sebum and dead cells
  • • Nodule – Deep, solid, inflamed lesion in cystic acne
  • • Cyst – Sac-like lesion filled with fluid or semi-solid material; deepest type of acne lesion

    • Watch Out For

    > ⚠️ Rosacea is NOT acne. Using aggressive acne treatments on rosacea clients can cause serious irritation. Always identify the condition before selecting products.

    >

    > ⚠️ Extraction contraindication: Never extract a pustule showing signs of spreading infection — this can push bacteria deeper, worsen the infection, or introduce bacteria into the bloodstream.

    >

    > ⚠️ Milia vs. whiteheads: Milia are not caused by clogged sebaceous follicles — they are keratin-filled cysts and do not respond to standard acne extractions.


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    Hyperpigmentation & Vascular Conditions


    Overview

    Pigmentation and vascular conditions require estheticians to identify causes, recognize contraindications for treatment, and understand when referral is necessary. Many of these conditions are worsened by UV exposure or aggressive treatments.


    Hyperpigmentation Conditions


    | Condition | Description | Key Triggers |

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

    | Melasma | Irregular brown patches, primarily on the face | Hormones (pregnancy, birth control), UV |

    | Post-inflammatory hyperpigmentation (PIH) | Darkening at site of former injury or inflammation | Acne, burns, aggressive treatments |

    | Vitiligo | White, depigmented patches from melanocyte destruction | Autoimmune attack on melanocytes |


    > 📌 PIH is more common and pronounced in darker skin tones (Fitzpatrick IV–VI).


    Vascular Conditions


    | Condition | Description | Notes |

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

    | Telangiectasias | Permanently dilated capillaries visible at skin surface | Refer to physician; avoid aggressive treatments |

    | Port-wine stain | Flat, permanent, deep red-to-purple birthmark | Present at birth; permanent |

    | Strawberry hemangioma | Raised, bright-red vascular tumor | Appears after birth; may fade with age |


    Key Terms

  • • Melanocyte – Pigment-producing cell in the epidermis
  • • Melanin – Pigment produced by melanocytes; responsible for skin color
  • • Hyperpigmentation – Excess melanin causing darkened areas
  • • Depigmentation – Loss of pigment (as in vitiligo)
  • • Fitzpatrick Scale – Classification of skin types I–VI based on response to UV exposure

    • Watch Out For

    > ⚠️ Melasma and heat: Heat can worsen melasma. Avoid steam and heat-generating treatments on clients with melasma.

    >

    > ⚠️ Vitiligo is autoimmune — it is not contagious. Do not confuse it with tinea versicolor, which also causes discolored patches but has a fungal cause.

    >

    > ⚠️ Telangiectasias cannot be removed by estheticians — always refer for medical treatment and avoid harsh or stimulating treatments on affected areas.


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    Inflammatory & Infectious Conditions


    Overview

    Some skin conditions are contraindications for esthetic services because they are contagious, compromised, or require medical treatment. Knowing the cause (bacterial, viral, fungal, or immune-mediated) helps determine appropriate action.


    Inflammatory (Non-Infectious) Conditions


    | Condition | Cause | Esthetician Considerations |

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

    | Contact dermatitis | Irritant or allergic reaction to direct contact | Identify triggers; avoid irritants; patch test |

    | Atopic dermatitis (eczema) | Chronic, hereditary; compromised skin barrier | Use gentle products; avoid exfoliants and steam |


  • • Irritant contact dermatitis: Direct tissue damage from a substance (e.g., strong acids)
  • • Allergic contact dermatitis: Immune-mediated reaction (e.g., fragrance, nickel)

    • Infectious Conditions


    | Condition | Cause | Contagious? | Esthetician Action |

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

    | Herpes simplex (cold sores) | Herpes simplex virus type 1 (HSV-1) | Yes | Contraindication; refer; do not perform facial |

    | Impetigo | Staphylococcus or Streptococcus bacteria | Highly contagious | Contraindication; refer to physician |

    | Tinea versicolor | Malassezia yeast overgrowth | Low | Refer to physician for antifungal treatment |

    | Verruca (warts) | Human papillomavirus (HPV) | Yes | Do not treat; refer to physician |


    Key Terms

  • • Contraindication – A condition that makes a particular treatment inadvisable or unsafe
  • • Pathogen – A microorganism that causes disease (bacteria, virus, fungus)
  • • Atopic – Relating to hereditary hypersensitivity; genetic predisposition to allergic conditions
  • • Urticaria – Clinical term for hives; wheals caused by allergic reaction

    • Watch Out For

    > ⚠️ Herpes simplex is a hard contraindication. Any active cold sore outbreak means no facial service. Massage and product application can spread the virus across the face.

    >

    > ⚠️ Eczema ≠ contagious. Students often confuse eczema with infectious conditions. Atopic dermatitis is hereditary and immune-mediated — it is not contagious, but the compromised barrier requires gentle handling.

    >

    > ⚠️ Tinea versicolor is caused by yeast (Malassezia), not a dermatophyte fungus like ringworm. Discoloration can be lighter OR darker than surrounding skin.


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    Skin Cancer & Growths


    Overview

    Estheticians are often in a unique position to observe suspicious skin changes during services. The esthetician's role is never to diagnose but always to recognize warning signs and refer to a licensed physician or dermatologist.


    The ABCDEs of Melanoma


    | Letter | Meaning |

    |---|---|

    | A | Asymmetry – Two halves do not match |

    | B | Border – Irregular, ragged, or notched edges |

    | C | Color – Multiple shades or uneven color distribution |

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

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


    Types of Skin Cancer


    | Type | Origin | Appearance | Metastatic Risk |

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

    | Basal cell carcinoma | Basal cells of epidermis | Pearly, raised nodule; rolled border | Very low (rarely metastasizes) |

    | Squamous cell carcinoma | Keratinocytes of epidermis | Scaly red patch; wart-like growth | Moderate (can spread to lymph nodes) |

    | Melanoma | Melanocytes | Irregular, multi-colored lesion | High; most dangerous form |


    Benign Growths


    | Growth | Description | Notes |

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

    | Seborrheic keratosis | Waxy, "stuck-on" appearing growth; brown/tan | Benign; common in older adults |

    | Actinic keratosis | Rough, scaly, pre-cancerous patch | Caused by UV damage; can progress to squamous cell carcinoma |

    | Verruca (wart) | Raised, rough, HPV-caused growth | Contagious; refer to physician |

    | Keloid scar | Scar tissue extending beyond wound boundaries | Does not regress; requires medical treatment |

    | Hypertrophic scar | Excess collagen within wound boundaries | May improve over time |


    Key Terms

  • • Carcinoma – Cancer arising from epithelial cells
  • • Melanoma – Malignant tumor of melanocytes; most dangerous skin cancer
  • • Metastasize – Spread of cancer from the original site to other parts of the body
  • • Actinic keratosis – Pre-cancerous lesion caused by cumulative UV damage
  • • Scope of practice – The legal boundaries defining what an esthetician is and is not permitted to do

    • Watch Out For

    > ⚠️ Never diagnose. Regardless of how obvious a lesion appears, an esthetician cannot diagnose skin cancer or any other skin condition. Always refer to a dermatologist.

    >

    > ⚠️ Actinic keratosis is pre-cancerous, not benign. It is different from seborrheic keratosis, which is benign. Both names sound similar — know the difference.

    >

    > ⚠️ Keloid vs. hypertrophic scar: The key distinction is boundary. Keloids grow beyond the original wound; hypertrophic scars stay within it.

    >

    > ⚠️ Basal cell carcinoma is the most common but least dangerous skin cancer. Melanoma is the least common but most dangerous.


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    Quick Review Checklist


    Use this checklist before your exam to confirm mastery of the most critical points:


  • • [ ] Distinguish macule (flat) from papule (raised, solid) from vesicle (raised, fluid-filled)
  • • [ ] Know that a pustule contains pus; a vesicle contains clear serous fluid
  • • [ ] Identify a bulla as a large vesicle (> 0.5 cm)
  • • [ ] Explain fissures as deep cracks into the dermis; excoriations as superficial scratch wounds
  • • [ ] Differentiate open (blackhead/oxidized) from closed (whitehead/sealed) comedones
  • • [ ] Recall that Grade IV cystic acne involves deep nodules and cysts with scarring risk
  • • [ ] Identify rosacea as chronic central facial redness — not the same as acne
  • • [ ] Describe milia as keratin-filled cysts, most common around the eyes
  • • [ ] List triggers for melasma: hormonal changes + UV exposure
  • • [ ] Define PIH as post-inflammatory darkening; more pronounced in darker skin tones
  • • [ ] Identify vitiligo as autoimmune destruction of melanocytes causing white patches
  • • [ ] State that telangiectasias require physician referral and gentle treatment avoidance
  • • [ ] Know both types of contact dermatitis: irritant (tissue damage) and allergic (immune-mediated)
  • • [ ] Treat atopic dermatitis with gentleness — avoid exfoliants, steam, and irritating products
  • • [ ] Recognize herpes simplex (active cold sore) as a hard contraindication for facial services
  • • [ ] Identify impetigo as a highly contagious bacterial infection — contraindication for services
  • • [ ] Know tinea versicolor is caused by Malassezia yeast overgrowth, not a dermatophyte
  • • [ ] Apply the ABCDEs to identify suspicious melanoma characteristics
  • • [ ] Recall that basal cell carcinoma is most common; melanoma is most dangerous
  • • [ ] Distinguish squamous cell carcinoma (higher metastatic risk) from basal cell carcinoma (rarely spreads)
  • • [ ] Differentiate actinic keratosis (pre-cancerous, UV-caused) from seborrheic keratosis (benign)
  • • [ ] Explain that keloids extend beyond wound boundaries; hypertrophic scars stay within them
  • • [ ] State that verruca (warts) are caused by
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