9.1 Hair Biology, Follicle Histology, and Growth Cycles
Key Takeaways
- Hair Removal is 15% of the PSI National Esthetician Theory outline in Georgia's current guide, v1.9 effective 4/28/2026 (75 scored items, 90 minutes); Rule 240-16-.02 budgets 75 Level 2 service-application hours for hair removal.
- O.C.G.A. § 43-10-1(8)(B) names trimming, tweezing, shaping, or threading eyebrows; § 43-10-1(8)(D) names waxing and threading the face, neck, arms, torso, or legs — and excludes diagnosis, treatment, or therapy of dermatological conditions, medical aesthetics, and lasers.
- Anagen is active growth with the hair attached at the bulb and papilla; catagen is the short transition; telogen is rest. Temporary epilation is most effective on anagen hairs, but neighboring follicles are not in the same phase.
- Hirsutism is excess terminal hair in an androgen-dependent pattern, typically discussed in women; hypertrichosis is excess hair not limited to that pattern and can occur in any sex. Georgia estheticians observe and refer — they do not diagnose endocrine disease.
- Waxing and tweezing remove the hair from the follicle; they do not destroy the bulge stem-cell population or the dermal papilla, which is why cosmetic hair removal is temporary.
Why follicle science sits in a 15% theory domain
A Saturday lip wax in a Midtown Atlanta suite looks like a two-minute service. It is actually an epilation of a living pilosebaceous unit: you grip a hair shaft, pull a root out of a follicle, and leave behind the dermal papilla and the bulge stem-cell niche that will build another hair. If you cannot name those parts, you cannot explain why the client is smooth for weeks rather than forever, why a neighbor follicle still shows a stub the same afternoon, or why a sudden beard-pattern chin on a woman is a referral rather than a "just wax it louder" problem.
In the current Georgia Esthetician Test Taker Guide v1.9, effective 4/28/2026, Hair Removal is 15% of the scored outline. The test is 75 scored questions plus 10 non-scored experimental items in 90 minutes, closed book. Georgia Rule 240-6-.02(2) still requires 70% on each of the written and practical examinations. This OpenExamPrep chapter is independent study material covering those hair-removal topics. It does not claim official approval, review, partnership, or exact equivalence with PSI, the Georgia State Board of Cosmetology and Barbers, or any outline.
Georgia already paid for the hours. Rule 240-16-.02 requires a complete esthetician course of at least nine months and 1,000 hours: 250 Level 1 theory plus 750 Level 2 service application. Level 2 Hair removal = 75 service-application hours, taught by a licensed esthetician instructor:
- lip, chin, face (tweezing, waxing, threading) — 10 hours / 20 applications
- leg waxing — 20 hours / 20 applications
- bikini waxing — 10 hours / 20 applications
- torso, back, and arm waxing — 10 hours / 20 applications
- brow arching and shaping — 25 hours, split as brow tweezing and threading (10/20), brow waxing (10/20), and brow lashing and tinting (5/10)
Brow lashing and tinting sit inside that 75-hour block so the school can count them. The chemistry, patch test, and lash-adhesive rules belong in Chapter 10. This chapter's job is the follicle and the methods that pull hair out of it.
O.C.G.A. § 43-10-1(8) is the statutory map of who may be paid to do this work. An esthetician or esthetics operator, for compensation, may engage in any one or a combination of listed practices. For hair, two lines matter:
- (B) trimming, tweezing, shaping, or threading eyebrows
- (D) waxing, threading, stimulating, cleansing, or beautifying the face, neck, arms, torso, or legs by hand, mechanical or electrical apparatus, or a cosmetic preparation
The same paragraph states that such practices of esthetics shall not include the diagnosis, treatment, or therapy of any dermatological condition or medical aesthetics or the use of lasers. A client who wants you to "kill the root with the laser in the back room" is asking for a modality the esthetician definition excludes. Temporary cosmetic hair removal on the listed body areas is the work.
Follicle histology you must be able to label
Hair is a keratin appendage of the skin. The shaft is the visible portion above the surface. The root sits in the follicle. Cutting or shaving removes only shaft, so a blunt tip returns quickly. Waxing, sugaring, tweezing, and threading are epilation: they remove shaft and root from the follicle for a longer temporary result. They do not delete the follicle.
| Structure | Where it is | Why a Georgia waxing room cares |
|---|---|---|
| Hair shaft | Above the skin | What the wax, sugar, thread, or tweezer grips |
| Cuticle | Overlapping scales on the shaft | Product adhesion; damaged cuticle can feel "grabby" or break |
| Cortex | Bulk of the shaft | Strength and color; coarse terminal hair has a thicker cortex |
| Medulla | Innermost core; often absent in fine vellus hair | Textbook identifier, not a wax setting |
| Hair follicle | Epidermal downgrowth into the dermis (sometimes deeper) | The pocket you empty; infected follicle = stop service |
| Infundibulum | Surface down to the sebaceous duct | Upper follicle; debris and sebum live here |
| Isthmus | Sebaceous duct down to the bulge / arrector attachment | Middle segment |
| Bulge | Stem-cell niche near the arrector pili | Survives a wax; this is a major reason hair returns |
| Inferior segment | Below the isthmus to the bulb | Fully developed in anagen; regresses in catagen |
| Hair bulb | Expanded base of the root | Houses the matrix |
| Hair matrix | Germinative keratinocytes | Anagen lengthening happens here |
| Dermal papilla | Vascular connective-tissue cone in the bulb | Capillaries nourish the growing hair |
| Inner root sheath | Around the hair inside the follicle | Guides the shaft upward |
| Outer root sheath | Follicle wall, continuous with epidermis | Part of the living pocket |
| Arrector pili | Smooth muscle on the follicle | Goosebumps; landmark for the bulge |
| Sebaceous gland | Usually opens into the follicle | Oil on the shaft fights wax adhesion until you cleanse |
Direction of growth is the tilt of that follicle, not a fashion choice. Upper lip, brow, underarm, and bikini patterns can reverse within a few centimeters. Map the area in good light before product touches skin. Soft-wax mistakes that ignore direction break hair at the surface instead of releasing the root — the client feels a pull and still sees stubble.
Lanugo, vellus, and terminal hair
| Type | Character | Typical adult picture | Service implication |
|---|---|---|---|
| Lanugo | Very fine fetal hair | Developmental knowledge; not the usual paid facial target | Do not label an adult's peach fuzz as lanugo on an exam item |
| Vellus | Soft, short, lightly pigmented "peach fuzz" | Much of the face and body | May not need aggressive hard wax; over-treating fine areas inflames skin |
| Terminal | Coarser, longer, more pigmented, deeper follicle | Brows, lashes, underarms, bikini pattern, beard-pattern zones, many legs | Primary cosmetic waxing target; stronger grip, smaller sections |
Hormones, genetics, age, and medications can shift a vellus-looking zone toward more terminal character. You observe. You do not announce a diagnosis across the steamer.
Anagen, catagen, telogen
Every follicle cycles. Neighbors are not synchronized, which is why a thorough leg wax still shows a scatter of short hairs days later — those follicles were not in a removable anagen state, or they were too short to grip.
| Phase | What the follicle is doing | Temporary-removal relevance |
|---|---|---|
| Anagen | Active growth. Matrix cells divide. Hair is attached at the bulb and nourished by the papilla. Inferior segment is present. | Epilation is most effective here: the hair is anchored so a correct pull is more likely to bring the root with the shaft. |
| Catagen | Short transition. Growth stops. Follicle involutes. A club hair begins to form as the bulb detaches from the papilla. | Textbook duration on scalp is often taught in weeks, not years. Hair is no longer in full productive growth. |
| Telogen | Rest. Club hair sits until it sheds and a new anagen hair eventually replaces it. Some texts add exogen as the shed step. | Explains natural fallout and "I already see hair" complaints that are cycle timing, not always a failed strip. |
Georgia Rule 240-16 does not publish numeric anagen lengths for the lip, bikini, or brow. Typical textbooks teach that scalp anagen can last years while eyebrow and eyelash anagen is much shorter (weeks-range), which is why brows need frequent shaping even when the client waxes the rest of the face on a longer cycle. Body sites sit between those extremes. Quote your textbook and the wax manufacturer for any millimeter hair-length target (commonly taught near ¼ inch / several millimeters). Do not invent a Board-published wait in days between waxes.
Why the result is temporary: correct waxing or tweezing empties the follicle of the hair that is there. The papilla and bulge remain. A new anagen hair will form. Selling "permanent wax" contradicts that histology and contradicts the laser exclusion in § 43-10-1(8).
Hirsutism versus hypertrichosis
These are medical descriptive terms from textbooks and dermatology, not Georgia license categories. You still need them because Domain 6 items and real consultation forms use them, and because they change whether you refer.
| Term | Working definition | Pattern | Esthetician action |
|---|---|---|---|
| Hirsutism | Excess terminal hair in a typically androgen-dependent distribution | Classically discussed in women: upper lip, chin, chest, abdomen, back, inner thighs — a male-pattern map | Cosmetic epilation may still be requested; sudden or rapidly increasing pattern with other systemic clues is a refer to a licensed medical provider. You do not diagnose polycystic ovary syndrome or adrenal disease. |
| Hypertrichosis | Excess hair not confined to that androgen-dependent map | Any sex; may be generalized or localized; may be congenital or associated with medications or other non-androgen causes | Same cosmetic tools if skin is intact; same no-diagnosis rule; refer when growth is sudden, localized in a strange patch, or paired with other unexplained changes. |
Scenario — Decatur consultation. A client books a chin and lip wax. She says the dark terminal hairs appeared over a few months with irregular cycles. You can explain anagen and a wax plan if the skin is intact and there is no other contraindication. You cannot tell her she "has PCOS." Document what you see, perform or decline the cosmetic service on its own merits, and refer medical questions to her physician. § 43-10-1(8) already took diagnosis off your table.
Scenario — Savannah legs. A man wants chest and back waxing for dense terminal hair he has had since adolescence, no sudden change. That picture is often taught as hypertrichosis or simply dense terminal hair — not "female hirsutism." Map direction, choose hard or soft wax by hair type, and run Georgia sanitation (section 9.2). You still do not wax over moles, inflamed follicles, or broken skin.
Credit hours on the clinic floor
Rule 240-16-.03 converts some of those 75 hours into student credit: one hair removal, waxing, or threading (lip, chin, face) is 30 minutes per application; one arching is 30 minutes; one hair removal (legs) is 2 clock hours; one hair removal (bikini) is 30 minutes. Those clocks are school-credit rules, not a promise that a rushed 8-minute leg wax met the curriculum. The biology you just studied is why a "quick" strip that ignores direction fails both the client and the credit logic.
Traps
- Treating Hair Removal's 15% as a small add-on after makeup (makeup is 3% on the same outline)
- Calling the shaft the part under the skin, or the root the visible stubble
- Swapping anagen and telogen
- Promising that one wax destroys the papilla or bulge
- Using hirsutism and hypertrichosis as interchangeable trivia words
- Diagnosing endocrine disease instead of referring
- Teaching laser hair removal as Georgia esthetician scope under § 43-10-1(8)
- Inventing Board-published anagen-day counts that Rule 240-16 does not contain
During which hair-growth phase is temporary epilation (waxing or tweezing) generally most effective, and why?
A woman requests chin and chest waxing for coarse, dark hairs in a typically male-pattern distribution that increased over a few months. Which statement is correct for a Georgia esthetician?
Under Georgia Rule 240-16-.02, how many Level 2 service-application hours are assigned to hair removal, and which brow services sit inside that block?