← Trichology: NY Cosmetology State Board Exam Flashcards

New York Cosmetology State Board Exam Study Guide

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

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Trichology: NY Cosmetology State Board Exam Study Guide


Overview

Trichology is the scientific study of the hair and scalp, covering hair structure, growth cycles, disorders, and properties. This study guide prepares you for the NY Cosmetology State Board Exam by organizing essential trichology concepts into clear categories. Mastering these topics ensures you can identify conditions, understand hair chemistry, and apply proper professional protocols in the salon.


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Table of Contents

1. [Hair Structure](#hair-structure)

2. [Hair Growth Cycle](#hair-growth-cycle)

3. [Hair Disorders & Diseases](#hair-disorders--diseases)

4. [Scalp Conditions](#scalp-conditions)

5. [Hair & Scalp Properties](#hair--scalp-properties)

6. [Quick Review Checklist](#quick-review-checklist)


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Hair Structure


Overview

The hair is a complex structure composed of multiple layers, supported by surrounding tissues and muscles. Understanding each component — from the visible shaft to the microscopic dermal papilla — is foundational to all cosmetology services.


The Hair Shaft: Three Layers (Outermost → Innermost)


| Layer | Location | Primary Function |

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

| Cuticle | Outermost | Protection; overlapping scale-like cells resist moisture loss and damage |

| Cortex | Middle | Strength, elasticity, and color (contains melanin pigment granules) |

| Medulla | Innermost core | Not fully understood; may influence hair thickness and texture |


> Memory Tip: Think C-C-M — Cuticle, Cortex, Medulla, from outside to inside.


Structures Below the Skin Surface


  • • Hair Shaft — The visible portion extending above the skin; composed of keratinized, dead cells
  • • Hair Follicle — The tube-like pocket in the skin that encloses the hair root and anchors the hair
  • • Hair Bulb — The region of rapidly dividing cells at the base of the follicle; produces new hair through mitotic activity
  • • Dermal Papilla — Located at the base of the hair bulb; contains blood vessels and nerves that nourish the follicle and are essential for growth and regeneration
  • • Arrector Pili Muscle — Small involuntary muscle attached to the follicle; contracts in response to cold or fear, causing hair to stand upright (goosebumps)

    • Composition of Hair


  • • Hair is approximately 97% keratin — a fibrous, sulfur-containing protein responsible for hair's strength, elasticity, and structure

    • Key Terms

  • • Hair shaft — Portion of hair projecting beyond the skin surface
  • • Hair follicle — Sheath surrounding the hair root
  • • Dermal papilla — Nutrient-supplying structure at the base of the follicle
  • • Hair bulb — Site of active cell division forming the hair shaft
  • • Arrector pili — Involuntary muscle causing goosebumps
  • • Keratin — Primary structural protein of hair (~97%)

    • Watch Out For

    > ⚠️ Exam Pitfall: The cortex contains melanin and provides color — not the cuticle. Students frequently confuse these two layers.

    >

    > ⚠️ Exam Pitfall: The dermal papilla feeds the hair bulb — do not confuse the papilla with the bulb itself. The bulb surrounds the papilla.


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    Hair Growth Cycle


    Overview

    Hair does not grow continuously. It cycles through three distinct phases, and understanding this cycle explains normal shedding, growth patterns, and many hair loss conditions.


    The Three Phases


    | Phase | Also Called | Duration | What Happens |

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

    | Anagen | Active Growth | 2–7 years | Hair bulb actively produces cells; shaft lengthens |

    | Catagen | Transition | ~2–3 weeks | Growth stops; follicle shrinks; hair detaches from dermal papilla |

    | Telogen | Resting | ~3–4 months | Follicle rests; old hair remains until pushed out by new anagen growth |


    > Memory Tip: A-C-T — Anagen, Catagen, Telogen. Think of it as "ACT" — the hair performs its act, transitions, then takes a rest.


    Key Facts

  • • The duration of the anagen phase determines the maximum potential length of a person's hair
  • • A healthy person sheds 50–100 hairs per day as a normal part of the telogen phase — this is not considered hair loss
  • • At any given time, the majority (~85–90%) of scalp hairs are in the anagen phase

    • Key Terms

  • • Anagen — Active growth phase (2–7 years)
  • • Catagen — Brief transitional phase (~2–3 weeks)
  • • Telogen — Resting phase (~3–4 months); shedding occurs

    • Watch Out For

    > ⚠️ Exam Pitfall: Shedding 50–100 hairs per day is normal, not pathological. Know this number precisely.

    >

    > ⚠️ Exam Pitfall: During catagen, growth stops and the hair detaches from the dermal papilla — do not confuse this with telogen, where the hair simply rests in the follicle.


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    Hair Disorders & Diseases


    Overview

    Cosmetologists must be able to recognize common hair disorders to determine whether a client can receive services or needs to be referred to a physician. Some conditions are contagious and require immediate refusal of service.


    Alopecia (Hair Loss Conditions)


  • • Alopecia Areata

    • - Cause: Autoimmune — the immune system attacks hair follicles

    - Presentation: Sudden, patchy hair loss in round or oval bald patches

    - Important: Not contagious; refer to physician


  • • Androgenic (Androgenetic) Alopecia

    • - Also known as: Male-pattern and female-pattern baldness

    - Cause: Genetic sensitivity of follicles to dihydrotestosterone (DHT), leading to progressive follicle miniaturization

    - Important: Most common form of permanent hair loss


    Contagious Conditions — REFUSE SERVICE


    > 🚫 REFUSE SERVICE AND REFER TO A PHYSICIAN for both of the following:


    | Condition | Type | Cause | Presentation |

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

    | Tinea Capitis | Fungal infection | Dermatophyte fungi | Scaly, itchy patches; possible hair loss |

    | Pediculosis Capitis | Parasite infestation | Pediculus humanus capitis (head lice) | Itching; visible lice or nits; transmitted by direct head-to-head contact or shared items |


    Structural Hair Disorders


  • • Monilethrix

    • - Type: Rare hereditary disorder

    - Presentation: Beaded appearance of the hair shaft due to periodic thinning; hair is brittle and prone to breakage


    Key Terms

  • • Alopecia areata — Autoimmune patchy hair loss
  • • Androgenic alopecia — Hereditary pattern baldness; linked to DHT
  • • DHT (Dihydrotestosterone) — Hormone responsible for follicle miniaturization in androgenic alopecia
  • • Tinea capitis — Fungal scalp infection caused by dermatophytes
  • • Pediculosis capitis — Head lice infestation
  • • Monilethrix — Hereditary beaded hair shaft disorder

    • Watch Out For

    > ⚠️ Exam Pitfall: Tinea capitis and pediculosis capitis are both contagious — you must refuse service and refer clients to a physician. Performing services on these clients is a sanitation and ethics violation.

    >

    > ⚠️ Exam Pitfall: Alopecia areata is autoimmune, not contagious. Do not confuse it with tinea capitis, which also causes patchy hair loss.

    >

    > ⚠️ Exam Pitfall: Know that androgenic alopecia involves DHT — this specific term may appear on the exam.


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    Scalp Conditions


    Overview

    Scalp conditions range from simple dryness to inflammatory diseases. Cosmetologists must distinguish between conditions they can address with salon services and those requiring medical referral.


    Common Scalp Conditions


    | Condition | Technical Term | Cause | Key Features |

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

    | Dandruff | Pityriasis capitis | Malassezia (yeast-like fungus) + excessive cell shedding | Oily, larger flakes; associated with sebaceous overactivity |

    | Dry Scalp | N/A (not a disease) | Lack of moisture | Smaller, dry flakes; no oily quality |

    | Seborrheic Dermatitis | Seborrheic dermatitis | Overactive sebaceous glands + Malassezia fungus | Red, greasy, flaky, inflamed skin |

    | Oily Scalp | Seborrhea | Excessive sebum secretion from sebaceous glands | Oily scalp and hair |


    Distinguishing Dandruff from Dry Scalp

  • • Dandruff: Larger, oily flakes; associated with the Malassezia fungus; may have an inflammatory component
  • • Dry Scalp: Smaller, dry flakes; caused purely by lack of moisture; no fungal involvement

    • Key Terms

  • • Pityriasis capitis — Technical term for dandruff
  • • Seborrheic dermatitis — Inflammatory condition with red, greasy, flaky scalp
  • • Seborrhea — Excessive sebum production (oily scalp)
  • • Malassezia — Yeast-like fungus associated with both dandruff and seborrheic dermatitis

    • Watch Out For

    > ⚠️ Exam Pitfall: Dandruff ≠ dry scalp. They have different causes and different appearances. Dandruff is linked to a fungus; dry scalp is linked to lack of moisture.

    >

    > ⚠️ Exam Pitfall: Both dandruff (pityriasis capitis) and seborrheic dermatitis are associated with Malassezia — but seborrheic dermatitis is more severe and involves inflammation (redness).


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    Hair & Scalp Properties


    Overview

    Understanding the physical and chemical properties of hair allows cosmetologists to assess hair condition, predict chemical service outcomes, and protect hair from damage.


    Porosity

  • • Definition: The hair's ability to absorb and retain moisture through the cuticle layer
  • • Why It Matters: Determines how quickly chemical services penetrate the hair; directly affects processing time and results
  • • Porosity Levels:

    • - Low porosity — Cuticle is tightly closed; resists moisture and chemicals; longer processing times needed

    - Normal porosity — Cuticle is slightly raised; absorbs moisture evenly

    - High porosity — Cuticle is raised or damaged; absorbs quickly but loses moisture easily; may over-process


    Elasticity

  • • Definition: The hair's ability to stretch and return to its original length without breaking
  • • Normal Range: Healthy wet hair can stretch up to 50% of its length and return to normal
  • • Low elasticity suggests protein deficiency or damage; hair is prone to breakage during chemical services

    • Melanin & Hair Color

    | Type of Melanin | Colors Produced |

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

    | Eumelanin | Brown to black tones |

    | Pheomelanin | Yellow, red, and orange tones |


    > Key Concept: The ratio and combination of eumelanin and pheomelanin determine an individual's natural hair color. Gray/white hair results from the reduction or absence of melanin production.


    Hypertrichosis

  • • Definition: An abnormal condition of excessive hair growth on areas of the body where hair is not normally found in that amount
  • • Affects: Both men and women, regardless of androgen levels
  • • Distinction from Hirsutism: Hypertrichosis is not androgen-dependent; hirsutism (excessive hair in women in androgen-sensitive areas) is androgen-dependent

    • Key Terms

  • • Porosity — Hair's ability to absorb and retain moisture via the cuticle
  • • Elasticity — Hair's ability to stretch and return to original length (up to 50% when wet)
  • • Eumelanin — Melanin producing brown/black tones
  • • Pheomelanin — Melanin producing yellow/red/orange tones
  • • Hypertrichosis — Excessive hair growth not linked to androgen levels

    • Watch Out For

    > ⚠️ Exam Pitfall: The 50% stretch figure applies to wet hair. Know this specific number.

    >

    > ⚠️ Exam Pitfall: Eumelanin = dark tones (brown/black); Pheomelanin = warm tones (red/yellow/orange). These are frequently reversed on exams.

    >

    > ⚠️ Exam Pitfall: Hypertrichosis is NOT the same as hirsutism. Hypertrichosis is not androgen-dependent and affects anyone.


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    Quick Review Checklist


    Use this checklist to confirm exam readiness. Check off each item as you master it:


    Hair Structure

  • • [ ] Name the three layers of the hair shaft in order (outermost to innermost): Cuticle → Cortex → Medulla
  • • [ ] Know which layer contains melanin and provides color/strength: Cortex
  • • [ ] Identify the function of the cuticle: protection and moisture barrier
  • • [ ] Explain the role of the dermal papilla: blood supply and nutrients to the hair bulb
  • • [ ] Identify what causes arrector pili contraction: cold or fear
  • • [ ] State the primary protein in hair: Keratin (~97%)

    • Hair Growth Cycle

  • • [ ] List the three phases in order: Anagen → Catagen → Telogen
  • • [ ] State the duration of each phase: Anagen 2–7 yrs / Catagen 2–3 wks / Telogen 3–4 months
  • • [ ] Know normal daily hair shedding: 50–100 hairs/day
  • • [ ] Understand that anagen duration determines maximum hair length

    • Hair Disorders & Diseases

  • • [ ] Identify alopecia areata as autoimmune and presenting as patchy hair loss
  • • [ ] Link androgenic alopecia to DHT and genetics
  • • [ ] Know that tinea capitis is fungal and requires refusal of service + physician referral
  • • [ ] Know that pediculosis capitis is head lice and requires refusal of service + physician referral
  • • [ ] Describe monilethrix: hereditary beaded hair shaft, brittle, prone to breakage

    • Scalp Conditions

  • • [ ] Distinguish dandruff (Malassezia + oily flakes) from dry scalp (moisture deficiency + dry flakes)
  • • [ ] Identify seborrheic dermatitis: red, greasy, flaky, inflammatory
  • • [ ] Define seborrhea: excessive sebum production = oily scalp

    • Hair & Scalp Properties

  • • [ ] Define porosity: absorption and retention of moisture through the cuticle
  • • [ ] Define elasticity: stretch and return; up to 50% when wet
  • • [ ] Identify eumelanin → brown/black; pheomelanin → yellow/red/orange
  • • [ ] Define hypertrichosis: excessive hair growth, not androgen-dependent

    • ---


    Good luck on your NY Cosmetology State Board Exam! Review this guide alongside your practical skills for complete preparation.

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