6.2 Infectious Nail Diseases

Disease means stop

Quick Answer: If the nail unit is infected, you do not service it. You do not file it, soak it in a shared basin, or cover it with product. You refuse, document, and refer to a physician. 18VAC41-20-270 A 4 requires licensees to take sufficient measures to prevent transmission of communicable and infectious diseases.

NIC Domain 2 asks you to recognize diseases of the nails as well as disorders. Domain 4 (Pre-Service, 5%) asks you to identify contraindications. Those two tasks meet at the table: a disease is a pre-service stop. Nail technicians do not culture organisms, do not prescribe antifungals, and do not “start the service and see.” A client who wants you to “just take the length down” on a crumbling, odorous toenail is asking you to aerosolize fungal material onto your station and the next client.

A disease in this chapter is an infectious or inflammatory process you can see as a salon contraindication. You still do not issue a medical diagnosis. You say, “I cannot perform nail services on this nail; this needs a physician,” not “I am diagnosing you with tinea unguium, take this cream.”

Fungal disease of the nail and foot

Onychomycosis (also called tinea unguium when a dermatophyte infects the nail) is a fungal infection of the nail unit. Signs: plate that is thick, brittle, crumbly, or powdery; yellow, white, or brown discoloration; subungual debris; possible odor; plate that may lift (onycholysis with junk under it). Toenails are more common than fingernails. Warm, wet environments and trauma help fungi invade. Contagious via scales, debris, and shared tools or basins.

Service: Stop. Do not clip through crumbling infected keratin as a full pedicure. Do not use the salon e-file on it. Do not put the foot in a whirlpool that will serve the next client. Do not apply polish or enhancement “to hide it.” Refer to a physician. After the client leaves, treat every implement and the basin as contaminated: single-use items discarded, multi-use items through the full Virginia clean-and-wet-disinfect sequence (Chapter 4).

Tinea pedis is athlete’s foot, a dermatophyte infection of foot skin (detailed again as a skin condition in 6.3 because NIC tests both the nail and the skin picture). Signs: itching, scaling, redness, maceration between toes, sometimes blisters on the sole. Contagious. A pedicure on active tinea pedis is how salons spread foot fungus. Stop the foot service and refer. Do not “work around” the toe webs with a callus rasp.

Bacterial disease around and under the nail

Paronychia is infection of the tissue around the nail—the fold and eponychium. Signs: redness, swelling, pain, tightness, and often pus. It follows a hangnail, aggressive nipping of living tissue, or a break in the fold. Bacteria (often staphylococci or streptococci) enter that portal. Contagious in the practical sense that pus and blood contaminate tools and can infect another person’s broken skin. Stop. Refer. Do not drain an abscess at the table. Do not soak a pus-filled fold in a finger bowl and call it a manicure.

Onychia is inflammation of the nail matrix, often with bacterial infection, pus, and a plate that may shed. The base of the nail looks angry; the client reports throbbing. Stop. Refer. Matrix infection is not a cuticle-care problem. Product on an onychia nail is malpractice-level poor judgment even before the Board’s communicable-disease rule.

Pyogenic granuloma in the nail unit appears as a red, vascular, often easily bleeding lump of tissue associated with severe inflammation, commonly from the nail bed or fold after injury or infection. It looks like proud flesh, not like a callus. Stop. Refer. Do not file it. Do not treat it with styptic and continue. This is physician-level tissue.

Pseudomonas aeruginosa is the bacterium behind the NIC green-yellow discoloration under a lifted nail enhancement. Moisture and debris sit in the pocket when product lifts. Pseudomonas produces pigments (including pyocyanin) that stain the underside of the enhancement and the plate green, green-yellow, or green-black. Clients call it a “greenie.” It is bacterial, not mold and not dermatophyte fungus. Predisposing salon errors: sealing a wet nail, ignoring lift, and leaving a moist gap. Service: Stop. Do not reseal the lift. Do not “paint over the green.” Remove the enhancement only if you can do so without grinding into infected or separated natural nail; when in doubt, refer for medical evaluation and postpone all product. Document. 18VAC41-20-270 F 2 already forbids a new artificial nail on that unhealthy plate.

Virus on the finger: warts and whitlow

Verruca (plural verrucae), the salon wart, is caused by human papillomavirus (HPV). Periungual and palmar warts look rough, cauliflower-like, with tiny black dots (thrombosed capillaries). They occur on fingers, around the nail, and on soles (plantar warts). Contagious through skin scales and contaminated implements. Do not cut, shave, or file a wart. Do not share the file that touched it. Stop the service on that area and refer. A technician who nips a periungual wart has created a blood-exposure and a transmission event.

Herpes of the finger—herpetic whitlow—is herpes simplex virus infection of the fingertip or fold. Signs: painful clustered vesicles (blisters) on an erythematous base, burning or throbbing, sometimes a history of a cold sore and a broken cuticle. Highly contagious. Vesicle fluid is infectious. Stop immediately. Refer. Do not puncture blisters. Do not continue “just the other hand” without treating this as a communicable-disease refusal and a tool-contamination event. A nail technician with a herpetic lesion on the finger does not work on clients until a physician has cleared the infectious period; you do not glove over active vesicles and proceed.

Exam trap: fungus versus Pseudomonas versus mold

NIC sample-style items love a green-yellow stain under product. The distractors are almost always mold and fungus.

True environmental molds can rarely involve nails in medical literature, but that is not the NIC salon teaching point. If the stem says green-yellow under a lift, answer bacterial Pseudomonas. If the stem says thick, yellow, crumbling toenail, answer fungal onychomycosis. If the stem says itching, peeling skin between toes, answer tinea pedis. Mixing those three is how candidates lose easy items.

Why you never “just cover it”

Product over an infectious nail does three harmful things at once:

1. It seals moisture against keratin, which is how Pseudomonas pigments a lift and how fungi thrive in onycholysis.
2. It hides the warning color so the next technician (or you, in two weeks) files through infected material.
3. It violates Virginia client-health rules: an infected, separated, or crumbling plate is not a healthy natural nail (270 F 2), and covering it does not prevent communicable disease (270 A 4).

Filing an onychomycotic nail launches spores and fragments into the air and onto your table. Soaking an infected foot in a pedicure basin that is only “drained and refilled” is a documented outbreak pattern for bacterial disease in foot spas. Both are exam-ready pictures of indirect transmission (Chapter 3) caused by a technician who treated a disease as a cosmetic disorder.

Worked recognitions

A Saturday fill: one index enhancement has lifted 2 mm at the free edge and the underside is green-yellow. Recognition: Pseudomonas, moisture pocket, bacterial. Action: stop on that nail, do not recap the lift, explain referral, document, disinfect. The other nine healthy nails do not magically make the green nail eligible for product.

A pedicure request: great toenail is opaque, crumbly, yellow-brown, with debris under a lifted edge and a sour odor. Recognition: onychomycosis / tinea unguium picture. Action: refuse the nail and the basin service that would share that debris; refer. Do not reduce it with a foot file “so shoes fit” as a salon medical treatment.

A manicure request: lateral fold is shiny, red, and so swollen the plate looks smaller; the client winces when you touch it. Recognition: paronychia. Action: refuse, refer. A hangnail that looks like this has left Section 6.1.

A new client: a cluster of painful blisters on the ring fingertip after a cuticle nick last week, and a cold sore last month. Recognition: herpetic whitlow picture. Action: stop before implements touch the vesicles. Refer. This is not eczema (Section 6.3) and not a hangnail.

Scope reminder

You will be tempted, in a shop that “always does it,” to clip the fungus, bleach the green, or glove and continue. That shop is practicing outside NIC safety teaching and outside Virginia sanitation standards. The Board does not grade customer convenience. Infectious disease of the nail is a physician problem. Your professional product is a clean refusal.