7.5 Nail Diseases, Contraindications & Refusing Service

The Legal Scope of Practice and The Absolute Rule of Contraindication

Knowing when not to perform a service is as important as knowing how to perform one.

What Constitutes a Nail Disease?

• Nail Disease: A nail disease is an active, infectious, inflammatory, or degenerative pathology affecting the nail unit, surrounding skin folds, or deeper tissues. Diseases are predominantly caused by pathogenic microorganisms—including fungi, bacteria, and viruses—or by severe systemic medical disorders.
• The Rule of Contraindication: In professional esthetics and manicuring, any condition that renders a particular service unsafe or hazardous to the client or the practitioner is defined as a contraindication. Signs of an active nail disease, such as infection, open lesions, blisters, inflammation, pus or swelling, mean you do not perform the service on that area.

What Kansas Law Says

K.A.R. 28-24-3(a) says no practitioner may provide any service to a consumer who has pediculosis, open sores, inflamed tissue suggesting a communicable disease or condition, fungus, lice or ringworm. The bar lasts until the consumer furnishes a statement signed by a licensed physician that the condition is not in an infectious, contagious or communicable stage. K.A.R. 28-24-3(b): if a service has started when you discover such a condition, stop immediately in a safe manner, tell the consumer why, and clean and disinfect all affected tools, work areas and waiting areas. The manicurist scope (K.S.A. 65-1901(f)) and the noninvasive rule (K.A.R. 28-24-1(l)) also mean a licensee does not:

1. Diagnosing: A technician must never attempt to diagnose a skin or nail disease, name a medical pathology to the client as a definitive clinical diagnosis, or provide medical opinions.
2. Treating or Curing: A technician must never apply medicinal ointments, systemic remedies, fungicides, or home concoctions in an attempt to treat, cure, or alleviate an infection.
3. Prescribing: A technician does not recommend or prescribe medications, over-the-counter or prescription.
4. Performing Minor Surgery: Technicians must never cut living skin, excise ingrown nail corners, drain abscesses, lance pustules, or shave calluses with razor blades (such as Credo blades).

The Mandatory Professional Protocol

When a contraindication is found during consultation, the technician declines the service on the affected area. The technician explains the reason politely and recommends a licensed physician or podiatrist. For conditions listed in K.A.R. 28-24-3, the service can proceed only after the client brings a physician's signed statement that the condition is not contagious. Serving an infected client risks spreading infection through implements, foot spas and surfaces to later clients.

Comprehensive Catalog of Testable Nail Diseases and Pathologies

1. Onychomycosis (Tinea Unguium)

• Definition and Etiology: An infectious fungal disease of the natural nail plate, primarily caused by dermatophytes (most commonly Trichophyton rubrum), non-dermatophyte molds, or Candida yeast species. It is highly contagious and spreads readily via contaminated pedicure foot basins, damp salon towels, or unsterilized metal implements.
• Hallmark Symptoms: Begins as a whitish or yellowish patch at the free edge or lateral borders that gradually spreads across the plate. As the fungus digests the hard keratin, the plate becomes severely thickened, brittle, discolored (yellow, brown, or dirty gray), opaque, and crumbly. Thickened keratin debris accumulates beneath the plate (subungual hyperkeratosis), causing the plate to lift from the nail bed. A distinct foul odor is often present.
• Salon Protocol: Contraindication. Kansas lists fungus in K.A.R. 28-24-3, so do not service the affected nails unless the client brings a physician's signed statement that the condition is not contagious. Do not file, buff, or apply polish over the fungal plate, which aerosolizes fungal spores and cross-contaminates files. Refer the client to a physician for medical antimycotic evaluation.

2. Paronychia

• Definition and Etiology: An acute or chronic bacterial infection and inflammation of the soft living tissues surrounding the nail, specifically the eponychium and lateral nail folds (sidewalls). It is predominantly caused by Staphylococcus aureus or Streptococcus bacteria that penetrate living tissue through a micro-tear caused by cuticle nipping, hangnail tearing, or aggressive biting.
• Hallmark Symptoms: Marked erythema (intense redness), acute edema (swelling), localized heat, severe throbbing pain, and the formation of a pustule or purulent exudate (pus) along the nail fold.
• Salon Protocol: Contraindication. Paronychia is an active bacterial infection with inflamed tissue. Immediately refuse service. Do not touch, squeeze, or apply warm soaks to the infected digit. Direct the client to seek immediate medical treatment, as untreated paronychia can track into the deep flexor tendon sheath of the finger.

3. Onychia

• Definition and Etiology: A severe, deep-seated bacterial inflammation affecting the living nail matrix bed.
• Hallmark Symptoms: Swollen, red, inflamed tissue at the base of the nail unit beneath the proximal nail fold, accompanied by pus formation, extreme localized pain, and progressive detachment and shedding of the entire nail plate from the matrix.
• Salon Protocol: Contraindication. Do not service the affected nail; refer the client to a medical practitioner.

4. Onychocryptosis (Ingrown Nail)

• Definition and Etiology: A condition where the sharp lateral margin or corner of the natural nail plate curls downward and pierces the living epidermal and dermal tissue of the lateral nail fold. Most commonly affects the great toenails, triggered by improper nail trimming (rounding corners down too deep into the sidewall), ill-fitting tight footwear, or hereditary curvature.
• Hallmark Symptoms: Severe localized pain, swelling, redness, and the development of tender granulation tissue where the nail edge has embedded into the skin. If bacteria penetrate the puncture site, secondary paronychia with pus develops.
• Salon Protocol: If the tissue is red, swollen, painful, broken, or infected, REFUSE SERVICE. Kansas's noninvasive rule means nail technicians never cut out, dig or excise an embedded ingrown nail spike. That is a medical procedure. Technicians may only gently file and trim healthy, uninfected nails straight across with slightly rounded corners. Refer clients with ingrown nails to a podiatrist.

5. Onychoptosis

• Definition and Etiology: The periodic shedding and falling off of one or more natural nail plates, in part or in whole, from the nail bed.
• Etiology: Triggered by severe matrix trauma, localized bacterial or fungal destruction of the bed attachment, or severe acute systemic diseases (such as syphilis, high fevers, or severe chemotherapy toxicity).
• Salon Protocol: CONTRAINDICATION while the nail bed is raw, exposed, or unhealed. Technicians must never apply artificial enhancements over a denuded nail bed. Refer to a physician.

6. Onycholysis

• Definition and Etiology: The lifting, loosening, or painless separation of the natural nail plate from the underlying living nail bed, typically beginning at the distal free edge and progressing proximally toward the lunula.
• Etiology: Can be non-infectious (mechanical trauma from using nails as screwdrivers, rough cleaning under the free edge, or allergic contact dermatitis caused by skin contact with uncured monomers or UV gel resins) or infectious (secondary to onychomycosis).
• Hallmark Symptoms: The detached portion of the nail plate loses its translucent pink appearance and turns opaque white, yellow, or gray due to air entering the subungual pocket.
• Salon Protocol: If the lifted area is clean, completely dry, and shows no signs of infection or discoloration, the technician may trim away the detached free edge to prevent snagging. However, NEVER apply nail enhancements, acrylics, or gels over onycholytic nails. Moisture will inevitably enter the pocket beneath the enhancement, creating a breeding ground for bacterial pathogens. If discoloration or pus is present, refuse service and refer to a doctor.

7. Pseudomonas Aeruginosa (The "Green Nail" Infection)

• Definition and Etiology: An opportunistic, gram-negative bacterial infection of the nail plate and bed caused by Pseudomonas aeruginosa. In salon folklore, this condition is notoriously and incorrectly called "mold"—mold is NEVER a human nail pathogen.
• Pathological Mechanism: Pseudomonas bacteria thrive in moist, warm, dark environments. When an artificial nail enhancement lifts slightly from the natural plate, moisture (from hand washing, sweat, or salon water baths) becomes trapped in the micro-pocket. If Pseudomonas bacteria enter, they colonize the anaerobic void and consume moisture and residual keratin lipids.
• Pigmentation: As the bacterial colony proliferates, it secretes water-soluble pigments: pyocyanin (blue-green) and pyoverdine (yellow-green). These pigments soak into the porous keratin layers of the natural plate, producing stains that transition from pale yellow-green to dark forest green and ultimately black.
• Salon Protocol: If a green stain is uncovered during enhancement maintenance or soak-off:
  1. Safely remove the lifted artificial product completely by the proper soak-off method (section 9.7), without prying.
  2. Clean the nail gently with soap and water or an antiseptic. Disinfectants are for implements and surfaces, never for skin or nails. Treat every implement that touched the nail as soiled.
  3. DO NOT file or buff aggressively into the green stain—the pigment has penetrated deep into the keratin layers, and attempting to file it away will ruin and perforate the natural nail plate.
  4. STRICT PROHIBITION: DO NOT REAPPLY an artificial enhancement, tip, or gel over the green discoloration. Covering the bacteria traps residual moisture and causes the infection to accelerate downward into the living bed. Refer the client to a physician.

8. Tinea Pedis (Athlete's Foot)

• Definition and Etiology: A highly contagious superficial fungal dermatophyte infection affecting the feet, particularly the interdigital spaces between the toes and the plantar surface.
• Hallmark Symptoms: Intense itching (pruritus), burning erythema, dry flaking or white macerated peeling skin between the toes, and clusters of tiny fluid-filled blisters (vesicles).
• Salon Protocol: Kansas lists fungus in K.A.R. 28-24-3, so no pedicure is performed unless the client brings a physician's signed statement that the condition is not contagious. Never place a client with active athlete's foot in a salon foot spa. Submerging infected feet contaminates the whirlpool basin, internal plumbing, and filter screens, placing all subsequent pedicure clients at grave risk of fungal transmission. Refuse service and refer to a physician or podiatrist.

9. Pyogenic Granuloma

• Definition and Etiology: A severe, vascular inflammatory lesion characterized by a rapidly growing, fleshy, protruding red lump of vascular granulation tissue that erupts from the nail bed or lateral fold up toward the plate.
• Hallmark Symptoms: Highly vascular, bleed profusely upon minimal contact, red or purplish nodule.
• Salon Protocol: Contraindication. Never touch, file, or service the lesion. Refer the client for medical care.

Diagnostic Summary: Diseases (Contraindications) vs. Disorders (Adaptations)

Professional Service Refusal Protocol and Client Communication

Refusing service to a paying client requires absolute professionalism, tact, and unwavering adherence to board safety regulations. Technicians must protect client confidentiality and avoid causing public embarrassment.

Professional Refusal Dialogue

When refusing service, the technician must frame the refusal strictly around client safety and legal licensing limitations, without uttering an unlawful medical diagnosis:

• "During my initial assessment of your hands, I observed some localized redness, swelling, and fluid along the side of your nail. Kansas rules don't allow me to perform services on skin that is inflamed or open like this unless a physician confirms it isn't contagious. Because your health and safety are my top priorities, I cannot perform a service today. I strongly recommend having a medical doctor or dermatologist examine this area. Once it has completely cleared up, I will be delighted to welcome you back for your nail services."

Immediate Station and Equipment Cleaning

Following the refusal (and, if the service had started, as K.A.R. 28-24-3(b) requires for all affected tools, work areas and waiting areas):

1. Immediately remove and dispose of all single-use porous items (nail files, buffers, orangewood sticks) in a closed waste container.
2. Clean all non-porous implements with soap or detergent and water, rinse with potable water, and fully immerse them in an EPA-registered bactericidal, virucidal and fungicidal disinfectant per the label (or bleach solution for 10 minutes), then rinse (K.A.R. 28-24-10).
3. Clean and disinfect the manicure table, client armrest, chair and any waiting-area surfaces the client touched.