3.3 Adverse Chemical Reactions, Allergy (Patch) Tests, Protective Barriers & Client Draping

Why Reactions Are Tested in Two Domains

PSI's outline lists "identifying adverse reactions to chemicals" and "protective chemical barriers and draping for clients" under Safety. It lists "allergic reaction (patch) test procedures" and "signs of adverse reactions to products during and after service" under Client Consultation. Together they form one skill: preventing reactions, spotting them early and responding correctly.

Two Kinds of Contact Dermatitis

Sensitization develops through repeated or prolonged skin contact with a reactive chemical. Methacrylate monomers and uncured gel are the classic examples, along with incompletely cured enhancement product and adhesive. The first exposures cause no symptoms. Once the immune system is primed, even small exposures trigger a reaction. For a technician, sensitization can end a career with acrylics or gels. For a client, it can mean a reaction to dental or medical materials containing related chemicals.

Signs of an Adverse Reaction

During a service:

• burning, stinging or heat beyond normal sensations;
• redness or swelling spreading around the cuticle and sidewalls;
• a client reporting sharp pain under an enhancement while it cures (a heat spike, covered in Chapter 7); or
• watering eyes, coughing or headache from vapors, which points to ventilation and dispensing problems.

After a service (often 1 to 2 days later):

• itching, redness and swelling of the nail folds or fingertips;
• small fluid-filled blisters (vesicles) or weeping skin;
• tenderness or throbbing of the nail bed, or the nail plate lifting from the bed (onycholysis);
• a rash on the face, eyelids or neck, which can follow from touching the face with product on the hands.

How to Respond

1. Stop applying the product.
2. Remove what can be removed safely. For a reaction to a fresh enhancement, that usually means removing it by soaking (Chapter 7).
3. Do not apply more product of the same chemical family over the reaction.
4. Refer the client to a physician for anything beyond mild, short-lived irritation, and do not work over inflamed or broken skin. If a condition might be contagious, Colorado's Rule 1.7(E) requires written authorization from a physician, physician assistant or advanced practice nurse before services on that area resume.
5. Record the reaction on the client's service record: the product, the reaction and the date. Do not repeat that product on that client.
6. Check your technique. Look for skin contact, an overly wet liquid-to-powder ratio, under-curing, a lamp that does not match the gel, or product flooding the cuticle.

The Allergy (Patch) Test

A predisposition test, commonly called a patch test, checks whether a client reacts to a product before a full service.

1. Review the client's history for known allergies and past reactions.
2. Read the manufacturer's directions; follow them where they differ from the general steps below.
3. Clean a small area of intact skin, typically behind the ear or on the inside of the elbow.
4. Apply a small amount of the product as directed and leave it undisturbed.
5. Read the result after 24 to 48 hours.
   • Negative: no redness, swelling, itching or blistering. The service may proceed.
   • Positive: redness, swelling, burning, itching, blistering or other irritation. Do not use the product on that client.
6. Record the date, product and result.

In Colorado the rules require a patch test in two places, neither of them a nail service. For eyebrow and eyelash tinting, Rule 1.8 requires the same precautions as any brow or lash coloring, "including but not limited to a predisposition test." For chemical or manual resurfacing exfoliation on certain clients, Rule 1.9(D) requires a patch test 24 hours before the procedure. Nail technicians may perform neither service, but the procedure is the same. For nail services, patch-test when the manufacturer directs it or when the client's history suggests sensitivity. Remember that a negative patch test does not guarantee a client will never become sensitized later.

Protective Chemical Barriers

Client Draping

Draping protects the client's skin and clothing from water, chemicals, dust and debris:

• a clean towel on the manicure table and under the client's hands, replaced for every client (Colorado Rule 1.7(H) bars reusing towels between clients, including towels used as hand or foot rests);
• a towel or disposable drape over the client's lap during pedicures and when removing enhancements;
• plastic-backed, lint-free towels or table covers under products that could soak through; and
• disposable slippers and toe separators, which are single-use.

Draping also protects you: dust and drips land on a removable layer rather than on clothing that carries contamination home.

Scenario

Two days after a set of gel extensions, a client calls to report itchy, red, swollen fingertips with tiny blisters along the cuticles. This pattern and timing are classic for allergic contact dermatitis to uncured methacrylates. The technician should not apply more gel. She should arrange removal, record the reaction and urge the client to see a physician, and she should not resume services over the inflamed skin until it has healed or a physician has cleared it. She should then review her technique: product touching the skin, thick layers, and a lamp that matched the gel brand and was used for the full cure time.