CANS Comprehensive Examination • 2026/2027
EXAM PREPARATION GUIDE
CANS Certification
Comprehensive Examination
2026/2027 (Latest Version) • Questions with Answers and Rationales
Page 1 of 54
, CANS Comprehensive Examination • 2026/2027
Section 1: Skin Science and Patient Evaluation
1. Which epidermal layer provides the primary barrier function of the skin?
A. Stratum corneum
B. Stratum basale
C. Stratum spinosum
D. Stratum granulosum
✓ Answer: A
Rationale: The stratum corneum is made of flattened keratinized cells in a
lipid matrix that prevents water loss and blocks entry of microbes and
irritants.
2. Where are melanocytes located?
A. Stratum corneum
B. Papillary dermis
C. Stratum basale
D. Hypodermis
✓ Answer: C
Rationale: Melanocytes sit in the basal layer and transfer melanin to
keratinocytes to protect against ultraviolet damage.
3. A client who always burns and never tans is classified as which
Fitzpatrick skin type?
A. Type II
B. Type I
C. Type III
D. Type IV
✓ Answer: B
Rationale: Type I has very fair skin and always burns. Type II usually burns
and tans minimally.
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, CANS Comprehensive Examination • 2026/2027
4. Which Fitzpatrick types carry the highest risk of post-inflammatory
hyperpigmentation after laser treatment?
A. Types I and II
B. Type II only
C. Types II and III
D. Types IV through VI
✓ Answer: D
Rationale: Higher melanin content makes darker skin more reactive to heat
and inflammation, so settings and wavelengths must be chosen
conservatively.
5. Which cells produce collagen and elastin in the dermis?
A. Fibroblasts
B. Keratinocytes
C. Langerhans cells
D. Melanocytes
✓ Answer: A
Rationale: Fibroblasts synthesize the extracellular matrix. Their activity
declines with age and is stimulated by retinoids, microneedling, and some
fillers.
6. Which skin layer contains adipose tissue that contributes to facial
volume?
A. Epidermis
B. Papillary dermis
C. Hypodermis
D. Reticular dermis
✓ Answer: C
Rationale: The hypodermis (subcutaneous layer) stores fat and cushions the
skin. Volume loss here contributes to facial aging.
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, CANS Comprehensive Examination • 2026/2027
7. A client has wrinkles at rest, sallow skin, and keratoses. Which Glogau
photoaging type is this?
A. Type I
B. Type III
C. Type II
D. Type IV
✓ Answer: B
Rationale: Type III (advanced photoaging) shows wrinkles at rest,
discoloration, and visible keratoses. Type IV shows only wrinkles with no
normal skin.
8. What is the most common type of skin cancer?
A. Melanoma
B. Squamous cell carcinoma
C. Basal cell carcinoma
D. Merkel cell carcinoma
✓ Answer: C
Rationale: Basal cell carcinoma accounts for most skin cancers. It grows
slowly and rarely metastasizes, often as a pearly papule with rolled borders.
9. Which lesion is most concerning for melanoma and requires referral?
A. A symmetrical tan macule unchanged for years
B. A flesh-colored skin tag
C. A uniform brown freckle
D. An asymmetric pigmented lesion with irregular borders that is changing
✓ Answer: D
Rationale: The ABCDE rule (asymmetry, border, color, diameter over 6 mm,
evolving) flags suspicious lesions. Refer for dermatologic evaluation before
aesthetic treatment.
Page 4 of 54
EXAM PREPARATION GUIDE
CANS Certification
Comprehensive Examination
2026/2027 (Latest Version) • Questions with Answers and Rationales
Page 1 of 54
, CANS Comprehensive Examination • 2026/2027
Section 1: Skin Science and Patient Evaluation
1. Which epidermal layer provides the primary barrier function of the skin?
A. Stratum corneum
B. Stratum basale
C. Stratum spinosum
D. Stratum granulosum
✓ Answer: A
Rationale: The stratum corneum is made of flattened keratinized cells in a
lipid matrix that prevents water loss and blocks entry of microbes and
irritants.
2. Where are melanocytes located?
A. Stratum corneum
B. Papillary dermis
C. Stratum basale
D. Hypodermis
✓ Answer: C
Rationale: Melanocytes sit in the basal layer and transfer melanin to
keratinocytes to protect against ultraviolet damage.
3. A client who always burns and never tans is classified as which
Fitzpatrick skin type?
A. Type II
B. Type I
C. Type III
D. Type IV
✓ Answer: B
Rationale: Type I has very fair skin and always burns. Type II usually burns
and tans minimally.
Page 2 of 54
, CANS Comprehensive Examination • 2026/2027
4. Which Fitzpatrick types carry the highest risk of post-inflammatory
hyperpigmentation after laser treatment?
A. Types I and II
B. Type II only
C. Types II and III
D. Types IV through VI
✓ Answer: D
Rationale: Higher melanin content makes darker skin more reactive to heat
and inflammation, so settings and wavelengths must be chosen
conservatively.
5. Which cells produce collagen and elastin in the dermis?
A. Fibroblasts
B. Keratinocytes
C. Langerhans cells
D. Melanocytes
✓ Answer: A
Rationale: Fibroblasts synthesize the extracellular matrix. Their activity
declines with age and is stimulated by retinoids, microneedling, and some
fillers.
6. Which skin layer contains adipose tissue that contributes to facial
volume?
A. Epidermis
B. Papillary dermis
C. Hypodermis
D. Reticular dermis
✓ Answer: C
Rationale: The hypodermis (subcutaneous layer) stores fat and cushions the
skin. Volume loss here contributes to facial aging.
Page 3 of 54
, CANS Comprehensive Examination • 2026/2027
7. A client has wrinkles at rest, sallow skin, and keratoses. Which Glogau
photoaging type is this?
A. Type I
B. Type III
C. Type II
D. Type IV
✓ Answer: B
Rationale: Type III (advanced photoaging) shows wrinkles at rest,
discoloration, and visible keratoses. Type IV shows only wrinkles with no
normal skin.
8. What is the most common type of skin cancer?
A. Melanoma
B. Squamous cell carcinoma
C. Basal cell carcinoma
D. Merkel cell carcinoma
✓ Answer: C
Rationale: Basal cell carcinoma accounts for most skin cancers. It grows
slowly and rarely metastasizes, often as a pearly papule with rolled borders.
9. Which lesion is most concerning for melanoma and requires referral?
A. A symmetrical tan macule unchanged for years
B. A flesh-colored skin tag
C. A uniform brown freckle
D. An asymmetric pigmented lesion with irregular borders that is changing
✓ Answer: D
Rationale: The ABCDE rule (asymmetry, border, color, diameter over 6 mm,
evolving) flags suspicious lesions. Refer for dermatologic evaluation before
aesthetic treatment.
Page 4 of 54
