10.1 Nail Physiology & Manicure Services

Key Takeaways

  • The nail plate is hardened keratin produced by the matrix, the nail's only living growth center; damage to the matrix causes permanent nail distortion
  • Fingernails grow about 1/10 inch (roughly 2.5 mm) per month, faster than toenails, faster in summer, and slightly faster on the dominant hand
  • The standard basic manicure follows a fixed order: sanitize hands, remove polish, shape, soak, care for the cuticle, clean under the free edge, massage, then finish
  • The eponychium is living skin at the nail base; the cuticle is dead tissue adhering to the nail plate — exam questions test that these are not the same structure
  • Never perform a manicure on a client with onychomycosis (ringworm of the nail) or paronychia; barbers recognize and refer disorders, they never diagnose or treat them
Last updated: July 2026

10.1 Nail Physiology & Manicure Services

Quick Answer: The nail is a hard plate of keratin produced by the matrix, its only living growth center. A barber's basic manicure follows a set order — sanitize, shape, soak, cuticle care, clean under the free edge, massage, finish — and service must be refused whenever a contagious nail disorder such as ringworm of the nail or paronychia is present.

Although the Texas Class A Barber exam is dominated by hair and shaving, nail and skin care is a scored content area, and the questions are highly repeatable: know the nail unit structures cold, know the manicure sequence, and know which disorders stop the service. Manicure and facial services are squarely inside the Class A Barber scope of practice. TDLR authorises a Class A Barber to perform manicures and pedicures and to perform cleansing and beautifying treatments of the face, neck, shoulders and arms — which is exactly why the written exam has a Nail and Skin Care domain and the practical exam includes a scored manicure and a scored facial. The one cosmetology service a Class A Barber may not perform is eyelash-extension application.

The Nail Unit: Anatomy to Memorize

The nail plate is the hard, translucent portion of the nail that rests on and slowly slides across the nail bed. It is constructed of about 100 layers of nail cells made of keratin, the same protein found in hair. The plate itself contains no nerves or blood vessels — it is dead, hardened tissue, which is why it can be cut and filed without pain.

StructureDefinitionExam Trap
MatrixThe area of living tissue at the base of the nail where nail cells are produced; contains nerves, lymph, and blood vesselsInjury here causes a permanently distorted nail
Nail rootThe base of the nail embedded underneath the skin, originating at the matrixThe root is alive; the plate is not
Nail bedThe portion of skin the nail plate rests on; supplied with many blood vessels that give the nail its pinkish colorThe plate slides along the bed but is attached to it
Free edgeThe part of the plate that extends over the fingertipFiled and shaped during a manicure
LunulaThe whitish half-moon at the base of the nail; the visible part of the matrixAlways at the base, never the tip
EponychiumThe living skin at the base of the nail covering the matrix areaLiving tissue — never cut it
CuticleThe dead, colorless tissue attached to the nail plate that the eponychium pushes upDead tissue — this is what is softened and pushed back
HyponychiumThe slightly thickened layer of skin under the free edgeProtects against infection under the free edge
Nail foldsThe folds of normal skin surrounding the nail plate on three sidesProximal fold plus two lateral folds
MantleThe deep pocket into which the nail root fitsHolds the root in place

The classic exam distinction is eponychium versus cuticle: the eponychium is living skin, the cuticle is dead tissue stuck to the plate. Cuticle removers and the cuticle pusher act on the dead cuticle — you do not cut living eponychium.

Nail Growth Facts

  • The average fingernail grows about 1/10 of an inch per month (approximately 2.5 millimeters).
  • Toenails grow more slowly than fingernails.
  • Nails grow faster in summer than in winter, and the nails of children grow faster than those of elderly people.
  • Nails on the dominant hand tend to grow slightly faster because of greater use and circulation.
  • It takes roughly four to six months for a fingernail to completely replace itself from matrix to free edge; toenails take up to about a year.
  • Growth is affected by nutrition, general health, illness, and age. The matrix, not the free edge, determines growth — conditioning the plate cannot speed it up.

Manicure Implements and Materials

A professional manicure setup uses a defined set of implements, and the exam expects you to know which ones are reusable metal implements that must be disinfected and which are porous, single-use items:

ImplementUseReusability
Metal cuticle pusherLoosens and pushes back the cuticleReusable — disinfect after every client
Cuticle nippersTrim hangnails and dead cuticle tags onlyReusable — disinfect after every client
Nail brushCleans nails and removes debrisClean and disinfect
Emery board / abrasive fileShapes and smooths the free edgePorous — single-use, discard
BufferSmooths ridges and adds shinePorous — single-use or per-client
Orangewood stickApplies cuticle remover, cleans under free edgeSingle-use, discard
Finger bowlHolds warm soapy water for soakingClean and disinfect

When filing, work from the corner toward the center of the nail rather than sawing back and forth, which can split the layers of the plate. Shape is chosen to complement the client's hands — oval, round, square, or squoval.

Standard Basic Manicure Procedure Order

  1. Sanitize — wash and sanitize your hands, then the client's hands.
  2. Remove old polish if present.
  3. Examine and discuss the nails; shape and file the free edge.
  4. Buff the nail plate lightly if desired.
  5. Soak the nails in warm, soapy water in the finger bowl to soften the cuticle.
  6. Cuticle care — apply cuticle cream or remover, then gently push back and lift the cuticle with a pusher or orangewood stick.
  7. Clean under the free edge with an orangewood stick.
  8. Massage the hand and arm with lotion.
  9. Clean the nail plate to remove oils before finishing.
  10. Finish — buff to a shine or apply polish if requested.

Hand and Arm Massage Manipulations

Massage during a manicure improves circulation, relaxes the client, and keeps the skin supple. The five standard manipulations:

  • Effleurage — light, continuous stroking movements applied with the palms and fingers; used to begin and end the massage.
  • Petrissage — kneading, lifting, and rolling the muscle tissue; deeply stimulates circulation.
  • Friction — deep rubbing movement used on joints and around the arm.
  • Tapotement — tapping, slapping, or hacking movements; the most stimulating form of massage.
  • Vibration — rapid shaking or trembling movements applied with the fingertips or whole hand.

Nail Disorders: Recognize and Refer, Never Diagnose

A barber's legal duty is to recognize abnormal conditions and refuse service when a condition is contagious or inflamed. Barbers do not diagnose, treat, or name diseases for clients — refer the client to a physician.

ConditionDescriptionService?
Onychomycosis / tinea unguiumRingworm of the nail; thickened, discolored, crumbling nailNo — highly contagious
ParonychiaInflammation and infection of the skin around the nail, often with pusNo
OnychiaInflammation of the nail matrixNo — refer to physician
OnychocryptosisIngrown nail; plate grows into the nail foldNo — never cut it; refer
Pyogenic granulomaVascular growth that bleeds easilyNo
OnycholysisSeparation of the plate from the bed without sheddingOnly if no signs of infection
LeukonychiaWhite spots in the plate, usually from minor matrix injuryYes
Beau's linesHorizontal ridges from illness or injuryYes
Hangnail (agnail)Split in the cuticleYes — trim the tag carefully, never rip it
Bruised nailBlood trapped under the plateYes — work gently, avoid pressure
OnychophagyBitten nailsYes — regular manicures can help the client stop

Sanitation of Manicure Implements

All reusable metal implements must be cleaned and then completely immersed in an EPA-registered disinfectant after every client, per TDLR sanitation rules. Porous items — emery boards, buffers, orangewood sticks — cannot be properly disinfected and are single-use: use them on one client and discard them. Never reuse a porous implement, and never place a used implement back into a clean supply. If a client bleeds during a service, stop, apply gloves, control the bleeding with pressure and an antiseptic, dispose of contaminated disposables properly, and disinfect all surfaces and implements before continuing.

Test Your Knowledge

Which part of the nail unit is responsible for producing new nail cells, such that injury to it can cause a permanently deformed nail?

A
B
C
D
Test Your Knowledge

Which statement correctly distinguishes the eponychium from the cuticle?

A
B
C
D
Test Your Knowledge

During a basic manicure, which step is performed immediately after soaking the client's nails in warm, soapy water?

A
B
C
D
Test Your Knowledge

A client arrives for a manicure with thickened, discolored, crumbling nails that you recognize as ringworm of the nail (tinea unguium). What is the correct response?

A
B
C
D