Louisville Beauty Academy (LBA), The College of Human Service of Di Tran University, proudly shares Chapter X of THE COMPLETE NAIL LICENSING MASTER BOOK — 2025 Edition.
As part of our mission to humanize education and remove fear from the licensing process, we are releasing all 50 chapters online for free for students, schools, ESL learners, and future beauty professionals across the nation.
Each chapter is part of the most comprehensive nail licensing textbook ever created, designed specifically for State Board Theory & Practical and built on our core philosophies:
YES I CAN™ (courage, confidence) and
I HAVE DONE IT™ (achievement, professionalism).
Louisville Beauty Academy continues to adapt and adopt at light speed, providing not only this complete textbook but also upcoming videos, visual guides, and step-by-step practical demonstrations, all aimed at ensuring every learner feels supported and empowered.
LBA is proud to serve as a true YES I CAN™ institution and a Center of Excellence in beauty education.
CHAPTER 3 — NAIL DISORDERS & DISEASES
Louisville Beauty Academy (LBA) — YES I CAN™, I KNOW WHEN TO STOP™
This chapter is one of the most important in licensing because safety begins with knowing:
- When you can perform a service
- When you should stop immediately
- When you must refer to a licensed medical professional
- When a condition is safe vs unsafe
- How to avoid spreading infection
- How to protect both the client and yourself
Louisville Beauty Academy always teaches with this rule:
“If you are unsure, do not perform the service. Refer out. Safety comes first.”
You are not a doctor.
You are not a medical provider.
You are a professional beauty service provider who must operate within legal scope.
And that is perfectly enough.
YES YOU CAN™ keep people safe.
YES YOU CAN™ recognize red flags.
YES YOU CAN™ protect your license.
🔥 LEGAL & LIABILITY-SAFE REMINDER (LBA Standard)
For safety and legal compliance:
❌ Nail technicians DO NOT:
- diagnose
- treat
- cure
- prescribe
- claim medical knowledge
✔️ Nail technicians DO:
- observe
- identify signs that require stopping a service
- refer to licensed medical professionals
- maintain sanitation
- protect health
- perform beauty services on safe, healthy nails
This language protects you, the client, and LBA.
✨ KEYWORDS WITH DEFINITIONS, EXAMPLES, USES & SENTENCES
These are the disorders licensing exams focus on most.
1. Onycholysis
Meaning: Separation of the nail plate from the nail bed.
Example: White area lifting from free edge backward.
Use: To describe lifting that is not caused by fungus.
Don’t use: To diagnose causes.
Sentence:
“I see onycholysis, which is nail lifting; we cannot perform service today.”
LBA Tip: Lysis = lifting.
2. Onychomycosis (Fungal Nail Infection)
Meaning: Fungus infection of the nail.
Example: Yellow/brown, thick, crumbly nail.
Use: Only to identify appearance.
Don’t use: To confirm diagnosis.
Sentence:
“This nail shows fungal-like symptoms; please see a medical professional.”
LBA Tip: Myco = fungus.
3. Paronychia
Meaning: Inflammation or swelling around the nail fold.
Example: Red, warm, swollen skin.
Use: To recognize unsafe skin conditions.
Don’t use: To continue any service.
Sentence:
“The skin looks inflamed; we cannot work on it today.”
LBA Tip: Paronychia = painful skin.
4. Onychorrhexis
Meaning: Brittle, split nails.
Example: Nails that crack easily.
Use: When advising gentle care.
Don’t use: For infections.
Sentence:
“These nails are brittle; let’s treat them gently today.”
LBA Tip: Rhexis = break.
5. Leukonychia
Meaning: White spots on the nail plate.
Example: Small white marks from mild trauma.
Use: To explain harmless nail changes.
Don’t use: As sign of disease.
Sentence:
“These white spots are normal and usually grow out.”
LBA Tip: Leuko = white.
6. Pterygium
Meaning: Skin grows forward over the nail plate.
Example: Excessive scar-like skin.
Use: To identify an abnormal growth pattern.
Don’t use: To push or cut—it can cause injury.
Sentence:
“This looks like pterygium; we must avoid working on it.”
LBA Tip: Pterygium = skin wings forward.
7. Onychophagy (Nail Biting)
Meaning: Habitual nail biting.
Example: Very short, damaged free edges.
Use: To advise gentle manicures.
Don’t use: When the skin is open or bleeding.
Sentence:
“These nails show signs of biting; let’s be gentle.”
LBA Tip: Phagy = eating.
8. Onychia
Meaning: Inflammation of the nail matrix.
Example: Pain around nail root.
Use: Recognize unsafe conditions.
Don’t use: Perform service.
Sentence:
“This area looks inflamed; we cannot continue today.”
LBA Tip: Onychia = inflamed matrix.
9. Hangnail
Meaning: Split of cuticle or skin.
Example: Small torn piece near the sidewall.
Use: When safe to trim dead skin only.
Don’t use: If area is red, swollen, or painful.
Sentence:
“You have a small hangnail; we will soften and treat gently.”
LBA Tip: Hangnail = small tear.
10. Blue Nails / Bruised Nails
Meaning: Discoloration from injury.
Example: Dark purple mark under plate.
Use: To identify bruising.
Don’t use: Add pressure or drill over.
Sentence:
“This discoloration looks like a bruise; let’s avoid pressure here.”
LBA Tip: Blue = bruise.
11. Eggshell Nails
Meaning: Thin, soft, flexible nails.
Example: Nails bending easily.
Use: When shaping gently.
Don’t use: Heavy filing or pressure.
Sentence:
“These nails are soft; we will handle them gently today.”
LBA Tip: Eggshell = fragile.
12. Koilonychia (Spoon Nails)
Meaning: Nail dips in the center like a spoon.
Example: Nail curves upward at edges.
Use: Recognizing shape changes.
Don’t use: Perform enhancements that require heavy filing.
Sentence:
“These spoon-shaped nails need gentle handling.”
LBA Tip: Koi = scoop.
13. Melanonychia
Meaning: Dark line or pigmentation in the nail.
Example: Brown or black streak.
Use: Recognize pigmented lines.
Don’t use: Diagnose cancer—refer out.
Sentence:
“This dark line should be checked by a medical professional.”
LBA Tip: Melano = pigment.
14. Onychatrophia
Meaning: Wasting away or shrinking nail.
Example: Thin, fragile nails.
Use: Gentle filing only.
Don’t use: Harsh chemical services.
Sentence:
“These nails are very thin; let’s be gentle.”
LBA Tip: Atrophy = weakening.
15. Onychocryptosis (Ingrown Nail)
Meaning: Nail grows into the skin.
Example: Painful sidewall.
Use: Recognize and stop service.
Don’t use: Attempt to fix—illegal.
Sentence:
“This looks like an ingrown nail; please visit a medical professional.”
LBA Tip: Crypto = hidden nail.
⚠️ SERVICES YOU MUST STOP IMMEDIATELY (LBA RULE)
Stop service if you see:
- swelling
- redness
- pus
- bleeding
- open skin
- fungus-like discoloration
- pain on touch
- unusual nail separation
- thick, crumbly nail plate
- dark streaks or pigmentation changes
Say this sentence:
“For your safety, we cannot perform a service today.
Please visit a licensed medical professional.”
This protects your license and the client.
❤️ LBA MINDSET MOMENT
You are not learning this chapter to become a doctor.
You are learning this to become a safe, smart, confident professional.
YES YOU CAN™ recognize danger.
YES YOU CAN™ protect yourself.
YES YOU CAN™ keep your clients healthy.
YES YOU CAN™ be licensed.
Louisville Beauty Academy believes in you fully.
📝 50 LICENSING-STYLE QUESTIONS — CHAPTER 3
- What is nail lifting from the bed called?
- What type of infection does onychomycosis describe?
- What condition shows redness and swelling around the nail?
- What does onychorrhexis mean?
- What causes white spots on nails?
- What is pterygium?
- What is nail biting called?
- What condition affects the matrix with inflammation?
- What is a small tear near the nail fold?
- What causes bruised nails?
- What type of nail is very thin and soft?
- What is the medical term for spoon nails?
- What condition involves dark lines in the nail?
- What refers to wasting away of the nail?
- What is the term for an ingrown nail?
- When must a technician stop a service?
- What should be done if fungus-like symptoms appear?
- What is the best way to describe leukonychia to a client?
- Why should pterygium not be pushed?
- Which condition involves separation of the nail?
- Which disorder is caused by injury under the nail?
- When should biting-related nails not be serviced?
- Which condition often looks yellow or brown?
- What indicates an unsafe inflammatory condition?
- What should be done when encountering melanonychia?
- What is the safe response to paronychia?
- Which condition causes the nail to curl upward?
- What does brittle nail splitting refer to?
- When must enhancements be avoided?
- What is the safest action when unsure of a condition?
- Why must onychomycosis be referred out?
- Which condition is harmless and grows out?
- What condition can be caused by biting?
- What is the meaning of mycosis?
- Which term refers to the matrix inflammation?
- What condition looks like skin growing over the nail?
- What is the safest way to handle bruised nails?
- What cannot be done on broken skin?
- What must the technician do during severe lifting?
- What is usually the appearance of fungal nails?
- What is the safe approach to thin, soft nails?
- Why must techs know disorders?
- What must be done when skin is swollen?
- Which condition shows crumbly nail texture?
- Which condition requires medical referral only?
- What must a tech do when seeing pus?
- Why should ingrown nails not be treated by techs?
- How should hangnails be handled?
- What should a tech say when stopping service?
- What is the LBA mindset for disorders?
📝 ANSWER KEY — CHAPTER 3
- Onycholysis
- Fungal infection
- Paronychia
- Brittle splitting
- Leukonychia
- Skin growing forward
- Onychophagy
- Onychia
- Hangnail
- Bruise
- Eggshell nails
- Koilonychia
- Melanonychia
- Onychatrophia
- Onychocryptosis
- Redness, swelling, pain, pus, bleeding
- Refer out
- Harmless white spots
- It can cause injury
- Onycholysis
- Bruised nail
- If skin is broken
- Onychomycosis
- Paronychia
- Refer to medical professional
- Stop service
- Koilonychia
- Onychorrhexis
- On damaged or infected nails
- Stop and refer
- It is an infection
- Leukonychia
- Onychophagy
- Fungus
- Onychia
- Pterygium
- Avoid pressure
- No service
- Stop service
- Yellow or brown, thick, crumbly
- Gentle handling
- To know when to stop
- Stop & refer
- Onychomycosis
- All infections
- Stop immediately
- Out of scope
- Gently trim dead skin only
- “For safety, we cannot perform a service.”
- YES I CAN™ protect my client and myself.
To access the full announcement and explore all 50 chapters of THE COMPLETE NAIL LICENSING MASTER BOOK, visit:
This book is LBA’s gift to the world — a fully public, free, humanized educational resource built to uplift every learner.
YES YOU CAN.
YES YOU WILL.
YES YOU HAVE DONE IT.
