14.1 Chemical and Mechanical Exfoliation

14.1 Chemical and Mechanical Exfoliation

Quick Answer: NIC II.E tests chemical and mechanical/manual exfoliation. Illinois estheticians may exfoliate only the stratum corneum. Public Act 104-0134 names microdermabrasion, hydrodermabrasion, and dermaplaning as surface devices. IDFPR’s Statement on Prohibited Practices (04/06/2026) lists chemical peels except superficial peels as the practice of medicine. The legal test is living-layer intent, not a brand name.

NIC Domain II, Skin Care and Services, is 45% of the scored National Esthetics Theory Examination. II.E is performing chemical and mechanical/manual exfoliation. Illinois does not rewrite the national methods list. It truncates depth. 225 ILCS 410/3A-1 limits esthetics to cosmetic work on the stratum corneum of the epidermis. 68 Ill. Adm. Code 1175.710 tests chemical service procedures. 1175.835 parks cleansing, mask therapy, facials with and without machines, and product knowledge in the 500-hour practices block. Chapter 11 taught why acids contract surface cells. This section is the service: which tool, which acid, which stop, and which Illinois line you may not cross because a bottle looks impressive.

Exfoliation is the controlled removal of dead corneocytes from the horny layer. It is not collagen induction and not a medical peel. If the honest intent is to wound living epidermis or dermis, the service is not profession 131.

Mechanical and manual methods

Manual methods use hands and a product. Mechanical methods add a device or a blade. NIC groups them because both are physical removal of surface cells, as opposed to chemical loosening or digestion.

Scrubs suspend abrasive particles (jojoba beads, rice powder, finely milled sugar) in a cream. Apply, use light circular pressure, and rinse. They belong on intact, non-inflamed skin. Skip active acne, rosacea, couperose, sunburn, and any face you just peeled or waxed. A scrub on inflamed papules is abrasion of injured skin. A grind that leaves linear scratches is a technique failure, not a thorough facial.

Gommage (French for “to erase”) is a cream, often enzyme-containing, applied, allowed to dry, then rolled off with the fingers. The roll lifts dead cells. It is still superficial. Follow the manufacturer’s dry time. Do not wet-roll a product designed to dry, and do not grind gommage across telangiectasia.

Brushing uses a rotary facial brush. It is mechanical polishing of the corneum. Keep bristle firmness and speed low on the face. Do not use rotary brushes on inflamed, infected, or erupting skin (1175.115 already forbids massaging that skin). Do not drag a spinning brush across couperose capillaries. Chapter 15 covers machine physics; the II.E point is that a brush is exfoliation, not a license to sand living layers.

Microdermabrasion comes in two common teaching forms:

• Crystal: aluminum oxide (or similar) crystals are projected onto the skin and vacuumed away with debris.
• Diamond-tip: an abrasive wand plus vacuum; no loose crystals.

Both are surface services when they remove dead cells, oil, and debris. Public Act 104-0134 (effective August 1, 2025) amended 225 ILCS 410/3A-1 to name microdermabrasion and hydrodermabrasion with dermaplaning as methods for care of the stratum corneum. That confirmation is not a blank check for dermal injury. 1175.115(d) requires any device to be used consistent with the manufacturer’s intended use, client safety, and scope. Pinpoint bleeding, raw shiny living epidermis, or a protocol labeled “dermal remodeling” means you have left esthetics. Stop, follow blood-exposure procedure if blood is present, document, and do not “do one more pass to even it out.”

Hydrodermabrasion pairs water (often with a cosmetic serum) and vacuum to loosen and evacuate surface debris. It is in the same statutory list. Water does not make it medicine. A living-layer setting does.

Dermaplaning uses a sterile, single-use blade held at about a 45-degree angle to shave the stratum corneum and vellus (“peach fuzz”). It is cosmetic surface work after P.A. 104-0134. The blade is a sharp: never wipe and reuse (Chapter 5). Dermaplaning is not electrolysis, not microneedling, and not a medical “dermal plane.” If the blade is used to wound living tissue, the statute’s surface confirmation does not save the service.

Chemical methods: enzyme, AHA, BHA

Chemical exfoliation loosens or digests corneocytes instead of grinding them off.

Enzymes — papain (papaya) and bromelain (pineapple) — are proteolytic. They digest keratin protein on the surface. Most enzyme protocols are timed and rinsed, not chemically neutralized. They are often the gentlest in-scope option for sensitive or first-time clients if the skin is intact.

Alpha hydroxy acids (AHAs) — glycolic (smallest common molecule, from sugar cane) and lactic (larger, also hydrating), plus mandelic, citric, malic, and tartaric — are water-soluble. They loosen corneocyte cohesion on the surface. On the Illinois exam they exist only as superficial tools.

Beta hydroxy acid (BHA) — salicylic acid — is oil-soluble, so it can enter sebum-filled follicles. That is why it is the acne-oriented superficial acid. It is still not medical treatment of cystic disease and not a medium peel.

Superficial versus medium versus deep

Map national peel vocabulary onto the Illinois living-layer line. Part 1175 does not publish a numeric pH or percentage cutoff. Depth and intent decide legality.

• Superficial / very light — stratum corneum. Enzyme; labeled superficial AHA or BHA. In scope as a cosmetic surface service used exactly as the manufacturer indicates (1175.120).
• Medium — living epidermis, often papillary dermis. Teaching example: trichloroacetic acid (TCA) at a medical-depth technique. Out of Illinois esthetics.
• Deep — reticular dermis. Teaching example: phenol (classic Baker-Gordon-type). Out of Illinois esthetics.

A “medical-grade” glycolic that is still labeled and used as a stratum corneum exfoliant can be esthetics. An “esthetician TCA facial” intended for living layers is not, no matter how pretty the logo is. Physician delegation still forbids holding a medium peel out as esthetics.

Contraindications before the first pass

Walk this list before acid, crystals, or a blade. One yes is enough to modify or stop.

• Broken, inflamed, infected, or erupting skin, including sunburn and open extractions — 1175.115
• Isotretinoin (systemic acne drug; brand example Accutane) during use and for at least six months after stopping — NIC-style caution for aggressive chemical exfoliation and waxing; this is a manufacturer/NIC teaching window, not a secret Illinois percentage
• Recent waxing on the same site — the follicle is open and the barrier is already stripped; peeling immediately after wax is a classic layering mistake
• Herpes simplex history or active vesicles — acids and abrasion can trigger or spread an outbreak; refuse active lesions; you do not prescribe antivirals
• Pregnancy (and often breastfeeding) for some acids, especially many salicylic labels; follow the manufacturer contraindication, not a classmate’s “lactic is always fine”
• Fitzpatrick IV–VI — not a ban on all exfoliation, but a post-inflammatory hyperpigmentation (PIH) risk flag: fewer passes, milder product, longer intervals, non-negotiable SPF
• Known allergy to the acid, aspirin/salicylates (for BHA), pineapple/papaya (for enzymes), or crystals
• A request for a medium or deep peel billed as esthetics — Illinois absolute no

Layering mistakes

Wax then peel (or peel then wax) on the same site in the same visit is the high-yield trap. Wax already removes corneum and opens follicles. Adding acid or crystals stacks injury. Other stacking errors: two professional acids the same day because “her skin is thick,” a rotary brush plus a glycolic plus a diamond pass because the menu is on sale, a home retinoid this morning plus a peel this afternoon, and microdermabrasion on skin that was just dermaplaned. Time is dose. Passes are dose. Manufacturer spacing exists so a superficial service stays superficial.

The Illinois exam will not ask you for a brand’s secret pH. It will ask whether the technique is intended to affect living layers. Answer with depth, contraindications, and 1175.120 manufacturer indication — never with a made-up legal percentage. A legally correct sequence is: intake and Fitzpatrick, confirm the product or device is superficial, skip every listed stop, choose one in-scope modality, time it, then finish with restoration and SPF in Section 14.2.