Section 2.3: Skin Conditions, Disorders, & Diseases

Skin Conditions: Transient and Treatable States

Unlike genetic skin types, skin conditions are temporary, treatable states of the skin. They are influenced by internal factors (hormones, stress, systemic health) and external factors (UV radiation, pollution, improper product usage). Understanding these conditions enables estheticians to customize treatments and know when to refer clients to a medical professional.

1. Acne

Acne is a chronic inflammatory disorder of the pilosebaceous unit. It involves four main factors: overproduction of sebum, follicular hyperkeratinization (retention hyperkeratosis), colonization of Cutibacterium acnes bacteria, and inflammation.

• Grade I: Mildest form. Consists of minor outbreaks of open comedones (blackheads) and closed comedones (whiteheads) with little to no inflammation.
• Grade II: Moderate acne. Characterized by a larger number of closed comedones, open comedones, and occasional inflammatory papules and pustules.
• Grade III: Inflammatory acne. Features numerous comedones, papules, and pustules, with active redness and swelling. This grade requires careful, non-aggressive handling.
• Grade IV: Severe cystic acne. Consists of deep, painful cysts, nodules, and pustules. This grade leads to severe scarring (ice-pick, boxcar) and is a strict contraindication for standard facial treatments, requiring immediate referral to a dermatologist.

2. Rosacea

Rosacea is a chronic vascular disorder characterized by facial redness, flushing, telangiectasias (dilated capillaries), and in some cases, inflammatory papules and pustules (often confused with acne, termed acne rosacea). In advanced stages, it can cause rhinophyma (enlargement of the nose). Triggers include hot or spicy foods, alcohol, caffeine, extreme temperatures, and stress.

3. Pigmentation Disorders

Pigmentation disorders arise from abnormal melanin production and distribution:

• Hyperpigmentation (Excess Pigment):
  • Melasma (Chloasma): Often called the "pregnancy mask," this presents as symmetrical, patchy brown pigment on the face, triggered by hormonal changes (pregnancy, birth control) combined with UV exposure.
  • Post-Inflammatory Hyperpigmentation (PIH): Dark spots left behind after an inflammatory lesion (like acne, a burn, or a scratch) heals.
  • Solar Lentigines: Commonly known as liver spots or age spots, these are flat, brown macules resulting from cumulative sun exposure.
• Hypopigmentation (Lack of Pigment):
  • Vitiligo: An autoimmune disorder where the body destroys its own melanocytes, resulting in smooth, white patches of skin.
  • Albinism: A genetic condition characterized by a partial or complete absence of melanin pigment in the skin, hair, and eyes.
  • Tinea Versicolor: A superficial fungal infection that inhibits melanin production, resulting in white, flaky patches that do not tan.

4. Dehydration & Aging

• Dehydration: A lack of water in the stratum corneum. It is characterized by a crepey, fine-lined texture, tightness, and a lack of elasticity. It is often caused by transepidermal water loss (TEWL) due to a damaged skin barrier.
• Aging: Classified into Intrinsic Aging (natural chronological aging governed by genetics) and Extrinsic Aging (external aging caused by lifestyle and environment, primarily UV radiation, which is responsible for 85% of aging and is termed photoaging).

Skin Lesions

A lesion is any mark, wound, or abnormality on the skin. Estheticians must distinguish between primary and secondary lesions to determine if a service is safe to perform.

Primary Lesions

Primary lesions are flat or raised abnormalities in the early stages of development.

• Macule: A flat, colored spot on the skin less than 1 cm in diameter, such as a freckle or a flat age spot. It is not elevated above the skin surface.
• Papule: A solid, raised elevation on the skin less than 1 cm in diameter that contains no fluid.
• Pustule: An inflamed, elevated papule filled with pus (a mixture of white blood cells, bacteria, and cellular debris).
• Vesicle: A small, clear fluid-filled blister less than 0.5 cm in diameter, such as those caused by herpes simplex (cold sores) or poison ivy.

Secondary Lesions

Secondary lesions develop in the later stages of a disease or injury and are characterized by an accumulation of material or loss of skin integrity.

• Crust: An accumulation of sebum, pus, and blood mixed with epidermal flakes, dried on the skin surface (a scab).
• Scale: Thin plates of epidermal flakes (excess dead keratinocytes) shedding from the skin, such as dandruff or psoriasis scales.
• Fissure: A linear crack or split in the epidermis that extends into the dermis, often occurring on dry hands, chapped lips, or heels.
• Keloid: A thick, raised scar resulting from excessive collagen production during tissue repair, extending beyond the original boundaries of the wound.

Disorders of the Sebaceous and Sudoriferous Glands

Glandular disorders can impact skin texture, hydration, and overall health:

1. Sebaceous Gland Disorders

• Milia: Small, firm, white epidermal cysts filled with keratin and sebum. They have no visible follicular opening and are common around the eyes and cheeks.
• Seborrhea: Severe oiliness of the skin caused by overactive sebaceous glands.
• Steatoma (Wen): A sebaceous cyst or subcutaneous tumor filled with sebum, varying in size from a pea to an orange, typically appearing on the scalp, neck, or back.

2. Sudoriferous Gland Disorders

• Hyperhidrosis: Excessive sweating caused by heat, genetics, or systemic conditions.
• Anhidrosis: A lack of sweat, preventing the body from regulating its temperature. This is a medical condition requiring physician referral.
• Bromhidrosis: Foul-smelling sweat, usually in the axillae or feet, caused by the bacterial decomposition of apocrine sweat.
• Miliaria Rubra (Prickly Heat): An acute inflammatory disorder of the sweat glands characterized by small red vesicles that burn and itch, caused by sweat duct blockage.

Comparison Table: Skin Lesions & Esthetic Actions

Exam Traps: Skin Conditions & Disorders

• Trap 1: Acne Grades Referral. Candidates often fail to recognize which grade of acne requires a medical referral. Grade IV (cystic acne) is a strict medical referral and cannot be treated with standard extractions or chemical peels.
• Trap 2: Papule vs. Pustule. Remember that a papule is solid and contains no fluid/pus, whereas a pustule is inflammatory and contains pus. Confusing these leads to incorrect extraction protocol questions on the exam.
• Trap 3: Milia Extraction. Milia are keratin-filled cysts with no follicular opening. They cannot be extracted by simply squeezing them. Doing so causes tissue damage. In many states, estheticians cannot use a lancet to open the skin; check state-specific board rules.