6.4 Skin-Care Safety, Hot Towels, Product Selection & Natural Nail Products and Repair

Key Takeaways

  • Colorado Rule 1.7(I) requires clean hands or gloves when preparing towel-warmer towels, fresh wet towels each day, and a warmer disinfected daily and left open overnight.

  • Colorado requires paraffin wax to be portioned for each client in a bag or container, or dispensed so the unused supply cannot be contaminated, and every used portion discarded (Rule 1.7(K)(5)).

  • Colorado requires any cream, lotion, mask, oil, wax or other product that becomes contaminated to be discarded immediately; dispense with a single-use or clean implement (Rule 1.7(L)).

  • Colorado allows exfoliation only of dead surface cells; Rule 1.8(A)(1) bars products or devices that go beyond the epidermis or are likely to injure the client.

  • A natural nail split or tear can be repaired with a fabric patch and resin or adhesive; treat it as a temporary repair until the break grows out.

Last updated: October 2026

Skin Care Is 10% of the Theory Test

PSI's Skin Care domain (10%) has two parts: safe massage movements (Section 6.3) and skin care safety. Skin care safety covers safe use of skin-care tools, machines and devices; safe application and removal of hot towels; safe product use and application for all skin conditions; and safe removal of calluses (Section 6.2). The Nail Care domain adds natural nail products, procedures and repair. All of these are about avoiding injury while delivering a cosmetic result.

Hot Towels

Colorado's Rule 1.7(I) is unusually specific about towel warmers:

  1. Wash your hands or wear gloves before preparing towels for the warmer.
  2. Wash and dry towels before wetting them again and putting them in the warmer.
  3. Prepare wet towels fresh each day; at day's end, remove unused steamed towels and wash and dry them.
  4. Wash and dry every towel used in the warmer at the end of the day and store it overnight in a clean, covered, closed container, not in the warmer.
  5. Clean and disinfect the towel warmer daily and leave it open overnight to dry completely.
  6. Follow the manufacturer's operating and care instructions.

Safe application and removal:

  • Test the temperature on the inside of your own wrist before every application. A towel too hot to hold is too hot for the client (see the scald data in Section 3.5).
  • Unfold the towel and let excess steam escape before wrapping it.
  • Ask about heat sensitivity. Be cautious with clients who have diabetes, neuropathy, circulatory problems, fragile skin or sunburn.
  • Wrap without pressure over the hand, forearm, foot or lower leg; never on broken or inflamed skin.
  • Remove the towel with a gentle wiping motion that also removes product, then place it directly in the closed soiled-linen container.
  • Towels are never reused between clients (Rule 1.7(H)).

Skin-Care Tools, Machines and Devices

Tool or deviceSafe use
Paraffin bathKeep covered and free of debris; follow the unit's temperature range; portion wax per client (bag, container or brush-on from a single-client portion) and discard each used portion (Rule 1.7(K)(5)); test temperature on your wrist; do not apply over broken skin, rashes or inflamed areas
Foot files and paddlesMetal files: clean and disinfect; paper or foam-coated files and pumice: single-use unless the manufacturer documents disinfection
Exfoliating gloves, mitts, spongesPorous; single-use or laundered as linens where appropriate
Electric files used for callus workOnly after Rule 1.9(F) training; use pedicure-specific bits and light pressure
Heated mitts and bootsFollow the manufacturer's instructions; use a barrier liner; check skin often
Massage devicesFollow the manufacturer's instructions; disinfect contact surfaces between clients

Safe Product Use for All Skin Conditions

Dispensing. Colorado Rule 1.7(L) requires creams, lotions, masks, oils, waxes, paraffin and similar products to be discarded immediately if they become contaminated. Permitted ways to avoid contaminating them include:

  • placing the amount needed for one service into a separate container and discarding what is left;
  • removing product from the container with a single-use disposable implement;
  • using a clean applicator or pump bottle; or
  • following the manufacturer's guidelines.

Matching products to the skin:

Skin conditionProduct approachAvoid
Dry or chappedRich creams, oils, paraffin on intact skinHarsh soaps, alcohol-heavy products
Oily or sweatyLight lotions; dehydrate nails well before enhancementsHeavy oils right before polish or enhancements
Sensitive or allergy-proneFragrance-free products; patch test new productsStrong fragrance, essential oils of unknown tolerance
Mature or thin skinGentle pressure, mild productsAggressive scrubs, high heat
Callused feetCallus softener as directed, then gradual filingCutting, excessive softener time
Broken, inflamed or infected skinNo service on that area; Rule 1.7(E) applies if it may be contagious; referAny product or friction

Exfoliation. Scrubs and softeners remove dead surface cells only. Colorado's Rule 1.8(A)(1) bars any product, device or technique that penetrates, destroys or alters skin beyond the epidermis, or is reasonably likely to cause harm. Rule 1.9's chemical-resurfacing rules apply only to estheticians and cosmetologists. A nail technician should use exfoliating products according to the manufacturer's directions and never as a "peel."

Wear gloves when handling callus softeners and other keratolytic products, which can irritate your own skin with repeated exposure.

Natural Nail Products

ProductPurposeSafety notes
Cuticle removerSoftens and loosens dead cuticle tissue on the plate; often contains potassium or sodium hydroxideAlkaline; keep off surrounding skin and remove it fully
Cuticle oil and creamCondition the cuticle and nail foldsUse a dropper or clean applicator
Nail strengthener or hardenerCoats or toughens soft nailsSome contain formaldehyde-releasing ingredients; overuse can make nails brittle
Base coatImproves polish adhesion; helps prevent stainingApply thin
Ridge fillerFills shallow ridges for a smooth surfaceUse instead of buffing ridges flat
Top coatSeals polish, adds shineSome fast-dry formulas contain strong solvents; ventilate
Polish remover (acetone or non-acetone)Dissolves polishFlammable; acetone dries the skin
Dehydrator and primerPrepare the plate for enhancementsKeep off skin

Natural Nail Repair

A split or partial break in the natural free edge can often be stabilized rather than clipped off.

  1. Assess: repair only a clean break in the free edge or plate that does not involve the nail bed, bleeding or infection. A break into the bed or with bleeding means first aid and referral, not repair.
  2. Prepare: clean and dehydrate the nail; lightly remove shine around the break with a fine abrasive (240 grit or finer), filing in one direction.
  3. Patch: cut a small piece of silk or fiberglass fabric to overlap the break by a few millimeters on each side, keeping it off the skin.
  4. Bond: apply a thin coat of nail resin or adhesive over the fabric so it is fully saturated; cure with an activator if the system uses one.
  5. Refine: apply a second thin coat, smooth with a fine buffer and finish with polish or a top coat.
  6. Advise: the repair is temporary; keep the nail short until the break grows out, and return for maintenance.

A wrap with a stress strip reinforces a weak stress area, and a paper or tea-bag patch is a short-term fix. Monomer-and-polymer or gel can also be used for a small repair, following each system's rules (Chapter 7).

Test Your Knowledge

Under Colorado Rule 1.7(I), where must towels used in a towel warmer be stored overnight?

A

Folded on the station under a clean towel

B

In the warmer itself, so they are clean and ready for the morning's first client

C

In the soiled-linen container until the next day

D

In a clean, closed container after washing and drying, not in the warmer

Test Your Knowledge

Which paraffin practice meets Colorado's Rule 1.7(K)(5)?

A

Returning used paraffin to the tank once it cools

B

Reusing a client's own paraffin at her next visit, provided it is labeled with her name

C

Having each client dip both hands directly into the main paraffin tank

D

Portioning paraffin per client in a bag or container and discarding each used portion

Test Your Knowledge

A jar of hand cream at the station has been touched by a technician's fingers during a service. What does Colorado's Rule 1.7(L) require?

A

Discard the contaminated product immediately

B

Refrigerate it to slow bacterial growth

C

Wipe the rim with alcohol and keep using it

D

Label it for that client's future visits

Test Your Knowledge

When is a natural nail repair with fabric and resin NOT appropriate?

A

When the nail will be polished afterward

B

When the break extends into the nail bed and is bleeding

C

When the client wants to keep her natural length

D

When the free edge has a small clean split

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