← Nail Disorders – Nail Technician License Exam Flashcards

Nail Technician License Exam Study Guide

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

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Nail Disorders – Nail Technician License Exam Study Guide


Overview

This study guide covers nail disorders essential for the Nail Technician License Exam, including identification of common conditions, infectious versus non-infectious classifications, and professional protocols. Understanding these disorders is critical for both client safety and exam success, as nail technicians must know when to provide service and when to refer clients to a physician.


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Table of Contents

1. [Nail Disorder Identification](#nail-disorder-identification)

2. [Nail Infections & Contraindications](#nail-infections--contraindications)

3. [Professional Protocols & Safety](#professional-protocols--safety)

4. [Causes & Contributing Factors](#causes--contributing-factors)

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


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Nail Disorder Identification


Overview

Nail disorders range from structural abnormalities to pigmentation changes. Nail technicians must be able to identify these conditions by their visual characteristics and understand their underlying causes.


Separation & Shedding Disorders


| Disorder | Medical Term | Key Characteristic |

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

| Nail plate detaches from free edge | Onycholysis | Begins distally (free edge) |

| Nail plate detaches from base | Onychomadesis | Begins proximally (base) |

| Complete nail shedding | Onychoptosis | Entire nail falls off |


  • • Onycholysis – Separation beginning at the free edge; nail detaches without shedding. Caused by injury, infection, or chemical exposure.
  • • Onychomadesis – Separation beginning at the proximal (base) end; often follows severe systemic illness.
  • • Onychoptosis – Complete periodic shedding of one or more nails; caused by systemic illness, high fever, or trauma.

    • > ### Watch Out For ⚠️

    > Onycholysis vs. Onychomadesis is a common exam trap. Remember: Onycholysis = free edge (distal); Onychomadesis = base (proximal). The prefix "mad-" can remind you it's more severe — it starts at the root.


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    Structural & Shape Disorders


  • • Koilonychia – Concave, spoon-shaped nail plate; associated with iron-deficiency anemia, thyroid disorders, or hemochromatosis.
  • • Onychauxis (Hypertrophy) – Abnormal thickening and overgrowth of the nail plate; caused by trauma, systemic disease, or chronic irritation.
  • • Eggshell Nail (Onychoschizia) – Thin, white, flexible nail plate that bends over the free edge; caused by dieting, nervous disorders, or chronic illness.
  • • Pterygium – Forward growth of the eponychium (cuticle) permanently adhering to the nail plate surface; must never be cut or forcibly removed.
  • • Onychophosis – Buildup of keratinized (callus-like) skin cells beneath the nail plate in the nail grooves; common in clients wearing tight shoes.

    • Key Terms:

  • • Eponychium – The living skin at the base of the nail plate (cuticle area)
  • • Nail matrix – The area under the base of the nail where new cells are produced
  • • Proximal – Toward the base/body
  • • Distal – Toward the free edge/tip

    • ---


    Surface & Texture Disorders


  • • Beau's Lines – Deep horizontal grooves or depressions running across the nail plate; caused by any temporary disruption of nail matrix activity (illness, fever, trauma, chemotherapy, malnutrition).
  • • Onychorrhexis – Abnormal brittleness with longitudinal (lengthwise) striations or ridges; nail splits along its length; caused by excessive filing, chemical exposure, or nutritional deficiency.
  • • Onychophagy – Medical term for nail biting; a habit-induced disorder damaging the nail plate, free edge, and surrounding soft tissue.

    • > ### Watch Out For ⚠️

    > Beau's lines = horizontal (transverse) grooves. Onychorrhexis = vertical/longitudinal ridges. These are frequently confused on exams. Think of "Beau's" as a belt going across, and "Orrhexis" as running lengthwise like a road.


    ---


    Pigmentation Disorders


  • • Leukonychia – White spots or streaks embedded in the nail plate caused by minor trauma to the nail matrix; grow out with the nail naturally.
  • • Melanonychia – Dark brown or black longitudinal streaks within or under the nail plate; caused by increased melanin production. ⚠️ May indicate a serious condition — always refer to a physician if observed.

    • > ### Watch Out For ⚠️

    > Leukonychia (white spots) is extremely common and benign — caused by minor trauma. Melanonychia (dark streaks) may appear similar to a nail stain but requires physician referral as it can signal melanoma. Never confuse these two on the exam.


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    Nail Infections & Contraindications


    Core Principle

    > Infectious conditions = REFUSE SERVICE + REFER TO PHYSICIAN

    > Non-infectious conditions = Generally safe to proceed with caution


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    Fungal Infections


  • • Onychomycosis – Broad term for any fungal infection of the nail; presents as yellow, thickened, crumbly nails.

    • - Tinea Unguium – A specific type of onychomycosis caused by a dermatophyte (ringworm fungus); tinea unguium is a subset of the larger onychomycosis category.

    - ❌ Nail technicians MUST refuse service and refer to a physician.


    > ### Watch Out For ⚠️

    > Know the relationship: Tinea unguium ⊂ Onychomycosis. Tinea unguium is one type of onychomycosis — all tinea unguium is onychomycosis, but not all onychomycosis is tinea unguium. Exams may try to trick you by using these terms interchangeably.


    ---


    Bacterial Infections


  • • Paronychia – Red, swollen, painful inflammation of the soft tissue (nail folds) surrounding the nail plate; bacterial infection.

    • - ❌ Contraindication — refuse service, refer to physician.

  • • Onychia – Inflammation of the nail matrix itself; can result in loss of the nail.

    • - ❌ Contraindication — refuse service, refer to physician.

  • • Green Nail Syndrome – Caused by Pseudomonas aeruginosa bacteria producing green pigment (pyocyanin); commonly develops under lifted nail enhancements.

    • - ❌ Never apply an enhancement over green nail — it traps bacteria in a warm, moist environment causing the infection to worsen and spread.


    Paronychia vs. Onychia Comparison:


    | Feature | Paronychia | Onychia |

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

    | Location | Nail folds (soft tissue around nail) | Nail matrix |

    | Result | Infection of surrounding skin | Can cause nail loss |

    | Both | Bacterial | Bacterial |

    | Both | ❌ Contraindication | ❌ Contraindication |


    ---


    Viral Infections


  • • Periungual/Subungual Verruca (Wart) – Wart-like growths under or around the nail caused by Human Papillomavirus (HPV).

    • - ❌ Contraindication — refuse service, refer to physician.


    Key Terms:

  • • Contraindication – A condition that makes a particular treatment inadvisable
  • • Dermatophyte – A fungus that infects skin, hair, or nails (ringworm)
  • • Pyocyanin – The green pigment produced by Pseudomonas aeruginosa
  • • HPV – Human papillomavirus, responsible for warts

    • ---


    Quick Reference: Infectious vs. Non-Infectious


    | ✅ Non-Infectious (Generally Safe to Service) | ❌ Infectious (Refuse & Refer) |

    |---|---|

    | Beau's lines | Onychomycosis / Tinea unguium |

    | Leukonychia | Paronychia |

    | Onychorrhexis | Onychia |

    | Koilonychia | Green nail syndrome |

    | Onychauxis | Periungual verruca (HPV wart) |

    | Ridges, eggshell nails | Melanonychia (refer for evaluation) |

    | Onychophagy | — |


    > ### Watch Out For ⚠️

    > Non-infectious disorders are not automatically safe to ignore — avoid inflamed, broken, or irritated tissue even with non-infectious conditions. You can service the client but must exercise caution and professional judgment.


    ---


    Professional Protocols & Safety


    The Golden Rule

    > When in doubt, refer out. If a condition appears infectious, unusual, or outside your scope of practice, refuse service and direct the client to a licensed physician or dermatologist.


    ---


    Condition-Specific Protocols


    #### Infectious Conditions

  • • Protocol: Refuse service on affected nail(s) → Refer to physician/dermatologist
  • • Never attempt to treat, diagnose, or work around an active infection
  • • Applies to: onychomycosis, paronychia, onychia, green nail, verruca

    • #### Green Nail Syndrome

  • • Never apply nail enhancements over green nails
  • • Covering bacteria creates a warm, moist environment that accelerates infection
  • • Document and advise client to seek medical treatment

    • #### Pterygium

  • • Gently work around the pterygium — do not cut or forcibly remove it
  • • Forced removal causes injury and potentially permanent damage
  • • Severe cases → refer to physician

    • #### Onychorrhexis (Brittle/Ridged Nails)

  • • Use gentle filing techniques — avoid aggressive back-and-forth motions
  • • Minimize exposure to harsh chemicals and excessive acetone
  • • Recommend nail strengtheners or conditioning treatments
  • • Buff ridges gently only if the nail is not inflamed

    • #### Melanonychia (Dark Streaks)

  • • Always refer to a physician — dark longitudinal streaks can indicate melanoma
  • • Do not assume it is a stain or cosmetic issue

    • ---


    Scope of Practice Reminders


  • • Nail technicians diagnose nothing — identification is for referral purposes only
  • • Only licensed physicians can diagnose and treat nail infections and diseases
  • • Nail technicians can service clients with non-infectious disorders while avoiding broken or inflamed tissue

    • > ### Watch Out For ⚠️

    > The exam may present scenarios asking what to do when you suspect a condition. The answer is almost always: refer to a physician — do not diagnose, do not treat. This applies even if you are "fairly certain" of what the condition is.


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    Causes & Contributing Factors


    Systemic Causes

    Many nail disorders reflect underlying health conditions. Recognizing these associations is important for both the exam and client consultations.


    | Nail Disorder | Associated Systemic Condition |

    |---|---|

    | Koilonychia | Iron-deficiency anemia, thyroid disease, hemochromatosis |

    | Beau's lines | Severe illness, high fever, malnutrition, chemotherapy |

    | Onychoptosis | Systemic illness, high fever, trauma |

    | Melanonychia | Increased melanin — may indicate melanoma |

    | Eggshell nail | Dieting, nervous disorders, chronic illness |

    | Leukonychia | Minor trauma to nail matrix |


    ---


    Salon-Related & Mechanical Causes


  • • Onycholysis – Aggressive cleaning under the nail, trauma from tools, overexposure to monomer liquid or acetone
  • • Onychorrhexis – Excessive filing, chemical exposure, nutritional deficiency
  • • Beau's lines – Can be caused by improper filing across the nail base or trauma to the matrix
  • • Hangnails – Dry skin, improper nail care, picking at the cuticle

    • Proper Hangnail Treatment:

    1. Carefully trim only the loose piece of skin with sanitized nippers

    2. Do not tear or bite the hangnail

    3. Apply cuticle oil or moisturizer after trimming

    4. Advise regular moisturizing to prevent recurrence


    ---


    Habit & Lifestyle Causes


  • • Onychophagy (Nail biting) – Damages nail plate, free edge, and soft tissue; nail technicians can service these clients but should recommend cessation
  • • Onychophosis – Wearing tight shoes creates recurring pressure; common in clients with foot nail issues

    • ---


    Key Contributing Factor Terms

  • • Nail matrix – Disruption here causes most surface disorders (Beau's lines, leukonychia, onychorrhexis)
  • • Nail bed – Separation disorders affect the nail bed (onycholysis, onychomadesis)
  • • Nail folds – Site of paronychia infection
  • • Melanocytes – Cells responsible for melanonychia when overactive

    • > ### Watch Out For ⚠️

    > Questions about causes often require you to distinguish between internal (systemic) causes and external (mechanical/chemical) causes of the same disorder. For example, onycholysis can be caused by both salon chemicals AND systemic disease — know both sides.


    ---


    Master Term Reference


    | Medical Term | Common Name | Key Feature |

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

    | Onycholysis | Nail separation | Free edge detachment |

    | Onychomadesis | Nail base separation | Proximal detachment |

    | Onychoptosis | Nail shedding | Complete nail loss |

    | Onychorrhexis | Brittle nails | Longitudinal ridges/splits |

    | Onychauxis | Thick nails | Overgrowth/hypertrophy |

    | Onychoschizia | Eggshell nail | Thin, flexible, white |

    | Onychophagy | Nail biting | Habit-induced damage |

    | Onychomycosis | Fungal nail infection | Yellow, thick, crumbly |

    | Onychophosis | Callus under nail | Keratinized buildup |

    | Leukonychia | White spots | Trauma-induced white marks |

    | Melanonychia | Dark streaks | Longitudinal pigmentation |

    | Koilonychia | Spoon nails | Concave nail shape |

    | Beau's lines | Horizontal grooves | Transverse depressions |

    | Pterygium | Cuticle overgrowth | Skin adheres to plate |

    | Paronychia | Nail fold infection | Red/swollen/painful folds |

    | Onychia | Matrix inflammation | Can cause nail loss |

    | Tinea unguium | Ringworm of nail | Dermatophyte fungus |

    | Verruca | Wart | HPV-caused growth |


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    Quick Review Checklist


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


    Identification

  • • [ ] I can distinguish onycholysis (free edge) from onychomadesis (base/proximal)
  • • [ ] I can identify Beau's lines (horizontal) vs. onychorrhexis (longitudinal/vertical)
  • • [ ] I know koilonychia = spoon-shaped nails associated with iron-deficiency anemia
  • • [ ] I can identify leukonychia (white spots from minor trauma) vs. melanonychia (dark streaks — refer to physician)
  • • [ ] I know pterygium = cuticle growing onto nail plate — never cut or forcibly remove
  • • [ ] I know onychauxis = thickened/overgrown nail plate (hypertrophy)
  • • [ ] I know eggshell nail (onychoschizia) = thin, flexible, white nail plate

    • Infections

  • • [ ] I know onychomycosis = fungal infection (broad term); tinea unguium is a specific type
  • • [ ] I know paronychia = infection of nail folds; onychia = infection of nail matrix
  • • [ ] I know green nail = Pseudomonas aerugin
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