9.3 Non-Infectious Disorders, Pigmentation & Dermatological Lesions

9.3 Non-Infectious Disorders, Pigmentation & Dermatological Lesions

CIDESCO Exam Tip: Distinguishing between primary and secondary dermatological lesions is a foundational requirement for CIDESCO candidates. Theoretical examinations test your ability to classify lesions, analyze non-infectious inflammatory diseases (dermatitis, psoriasis, rosacea), evaluate pigmentary dyschromias, and apply the ABCDE criteria to identify skin cancers.

Aesthetic practitioners must possess a rigorous vocabulary to describe cutaneous anomalies accurately. Skin conditions are broadly categorized into non-infectious inflammatory disorders, primary and secondary structural lesions, pigmentary dyschromias, vascular malformations, and pre-cancerous or malignant neoplasms.

Primary & Secondary Dermatological Lesions

Lesions are structural alterations in cutaneous tissue caused by disease, trauma, or aging. They are clinically divided into Primary (initial physical manifestations) and Secondary (evolved or altered manifestations).

Primary Lesions (Initial Manifestations)

• Macule: A flat, circumscribed change in skin color without elevation or depression, measuring <1 cm in diameter (e.g., freckle, flat nevus). A macule >1 cm is termed a Patch.
• Papule: A solid, elevated, palpable lesion measuring <1 cm in diameter (e.g., acne papule, elevated nevus).
• Plaque: A broad, elevated, flat-topped solid lesion measuring >1 cm in diameter, often formed by coalescing papules (e.g., psoriasis plaque).
• Nodule: A firm, solid, elevated palpable lesion extending deeper into the dermis or subcutaneous tissue, measuring 1 to 2 cm (e.g., dermal cyst).
• Tumor: A large, solid mass extending deep into tissue, measuring >2 cm in diameter.
• Vesicle: A small, circumscribed, fluid-filled elevation measuring <1 cm containing clear serous fluid (e.g., herpes simplex, varicella). A fluid-filled lesion >1 cm is termed a Bulla.
• Pustule: A circumscribed elevated lesion containing purulent exudate (pus composed of dead neutrophils, bacteria, and cellular debris) (e.g., acne pustule).
• Wheal (Urtica): A transient, edematous, raised erythematous lesion with central pallor caused by localized histamine release and dermal capillary leakage (e.g., hives, insect bite).

Secondary Lesions (Evolved or Traumatic Changes)

• Scale (Squama): Dry, flaking epidermal fragments of dead cornified cells resulting from abnormal keratinization (e.g., psoriasis, seborrheic dermatitis).
• Crust: Dried exudate composed of blood, serum, or pus on the skin surface (e.g., scab over healed erosion).
• Erosion: Focal loss of superficial epidermis that does not penetrate the basal layer; heals without scar formation.
• Ulcer: Deep loss of epidermis and dermis, extending into the subcutaneous tissue; always heals with scar tissue.
• Fissure: A linear crack or split through the epidermis into the dermis, caused by extreme dryness or loss of tissue elasticity (e.g., heel fissures, chapped lips).
• Scar (Cicatrix): Replacement of damaged dermal tissue with dense collagenous fibrous tissue following injury.
• Keloid: An abnormal hypertrophic overgrowth of fibrous scar tissue that extends beyond the original boundaries of the wound site.
• Excoriation: A surface punctate or linear abrasion caused by mechanical scratching, scraping, or picking.
• Atrophy: Thinning of the epidermis or dermis, resulting in translucent, wrinkled skin with loss of normal skin markings.

Non-Infectious Inflammatory Disorders

• Eczema / Dermatitis: Inflammatory skin conditions characterized by erythema, pruritus, edema, and scaling.
  • Irritant Contact Dermatitis: Non-immunological cutaneous damage caused by direct exposure to harsh physical or chemical agents (soaps, solvents, acids).
  • Allergic Contact Dermatitis: Type IV delayed T-cell mediated hypersensitivity reaction triggered by specific allergens (nickel, fragrances, preservatives, resin).
  • Atopic Dermatitis: Chronic, genetically linked inflammatory condition associated with epidermal barrier breakdown (filaggrin gene mutation), intense itching, dry skin, and lichenification in flexural folds.
  • Seborrheic Dermatitis: Chronic inflammation affecting areas with high sebaceous gland density (scalp, eyebrows, nasolabial folds), presenting as greasy, yellowish scales on erythematous skin, linked to Malassezia yeast activity.
• Psoriasis: A chronic, non-contagious autoimmune inflammatory disease characterized by hyperproliferation of keratinocytes driven by activated T-lymphocytes. Epidermal cell turnover accelerates from 28 days down to 3 to 5 days. Clinical features include sharply demarcated erythematous plaques covered with silvery-white scales on extensor surfaces (elbows, knees). Scraping scales reveals pinpoint bleeding (Auspitz sign).
• Rosacea: A chronic inflammatory vascular disorder affecting the central face (cheeks, nose, forehead, chin). Characterized by persistent facial erythema, flushing, telangiectasia, papules, and pustules (without comedones). Triggers include UV exposure, spicy foods, alcohol, extreme temperatures, and emotional stress. Severe end-stage rosacea may cause tissue hypertrophy of the nose (Rhinophyma).

Pigmentation & Vascular Disorders

Pigmentation Dyschromias

• Hyperpigmentation: Excessive melanin deposition in the epidermis or dermis.
  • Melasma (Chloasma): Symmetrical, blotchy hyperpigmented macules on the face, triggered by hormonal changes (pregnancy, oral contraceptives) combined with UV exposure.
  • Post-Inflammatory Hyperpigmentation (PIH): Pigmented macules occurring after cutaneous trauma or inflammation (acne, burns, chemical peels), particularly prevalent in Fitzpatrick phototypes IV–VI.
  • Solar Lentigines: Benign brown macules ("age spots") resulting from chronic UV-induced melanocyte proliferation.
• Hypopigmentation: Reduction or total absence of melanin.
  • Vitiligo: An autoimmune condition where melanocytes are destroyed, creating stark white depigmented macules and patches.
  • Albinism: A genetic enzyme deficiency (absence of tyrosinase) preventing melanin synthesis throughout the body, skin, hair, and irises.

Vascular Anomalies

• Telangiectasia: Permanently dilated, visible superficial capillaries or venules in the upper dermis.
• Cherry Angioma: Small, bright red, benign vascular papules composed of aggregated capillaries.
• Nevus Flammeus (Port-Wine Stain): A congenital flat vascular malformation consisting of mature capillaries; presents as a deep purple-red patch present at birth.

Skin Precancers & Cancers (ABCDE Criteria)

• Actinic Keratosis (Solar Keratosis): A pre-cancerous, rough, dry, scaly erythematous papule arising on chronically sun-exposed skin. May progress to Squamous Cell Carcinoma.
• Basal Cell Carcinoma (BCC): The most common form of skin cancer (accounting for ~80% of cases). Originates in the basal layer of the epidermis. Presents as a slow-growing, pearly or translucent papule with telangiectatic vessels, central ulceration, and a rolled border ("rodent ulcer"). Locally invasive but rarely metastasizes.
• Squamous Cell Carcinoma (SCC): Originates in keratinocytes of the stratum spinosum. Presents as a firm, scaly erythematous nodule or ulcerated plaque. Exhibits potential to metastasize to regional lymph nodes if left untreated.
• Malignant Melanoma: The most lethal form of skin cancer, originating from melanocytes. Highly invasive with rapid metastatic capacity.

The ABCDE Melanoma Screening Criteria

Beauty therapists must screen every client's skin for suspicious lesions using the ABCDE Rule:

                 ABCDE MELANOMA SCREENING CRITERIA
  +------------------------------------------------------------------+
  | A - ASYMMETRY        One half of the lesion does not match the   |
  |                      other half.                                 |
  | B - BORDER           Edges are irregular, ragged, notched, or    |
  |                      blurred.                                    |
  | C - COLOR            Pigmentation is non-uniform, featuring      |
  |                      shades of brown, black, red, white, or blue.|
  | D - DIAMETER         Greater than 6 mm (size of a pencil eraser).|
  | E - EVOLVING         Lesion changes in size, shape, color, or    |
  |                      develops itching, bleeding, or crusting.    |
  +------------------------------------------------------------------+

Clinical Action: If a lesion displays any ABCDE features, the therapist must never attempt to extract, exfoliate, or treat it. The therapist must document the observation and advise the client to seek immediate evaluation by a dermatologist.