3.4 Sebaceous & Sudoriferous Disorders

Sebaceous Gland Disorders

Because sebaceous glands are so active on the face, scalp, and upper back, their disorders are among the most frequently encountered conditions in an esthetics practice. Recognizing each one correctly determines whether a service can proceed, must be modified, or requires referral.

• Comedones are the basic acne lesion, formed when a hair follicle becomes blocked with sebum and dead skin cells. An open comedo (blackhead) has a wide follicle opening that stays open to air, causing the trapped material to oxidize and darken. A closed comedo (whitehead) has a closed follicle opening, so the material stays under the surface and appears as a small, flesh-colored or white bump.
• Milia are small, hard, pearly-white cysts filled with trapped keratin, most common around the eyes and cheeks. Unlike comedones, milia are not connected to a follicle opening and often require gentle lancing or extraction by a trained professional to release. Milia form when keratin becomes trapped beneath an unusually thick patch of stratum corneum rather than exiting through a follicle, which is why they resist standard comedone-extraction technique and typically need a fine, sterile lancet to open the overlying skin before the contents can be expressed.
• Sebaceous hyperplasia presents as small, benign, yellowish or skin-colored bumps, often with a central indentation, caused by an enlarged sebaceous gland. It is common on the forehead, nose, and cheeks of mature skin and is cosmetic rather than infectious, but persistent or changing lesions should still be evaluated by a physician to rule out other growths.
• Seborrhea describes an abnormal, excessive discharge of sebum, producing visibly oily skin and often contributing to conditions such as seborrheic dermatitis on the scalp and face.
• Acne vulgaris is a chronic inflammatory condition of the sebaceous follicles that progresses beyond simple comedones into inflammatory lesions: papules (small, raised, solid bumps), pustules (raised bumps containing pus), and in more severe cases, nodules and cysts that form deeper in the tissue. Mild to moderate comedonal acne is commonly addressed with proper cleansing, extraction technique, and professional exfoliation; papular and pustular acne must be treated cautiously to avoid spreading infection or scarring, and cystic or nodular acne is outside the esthetics scope and requires referral to a dermatologist.
• Steatoma, also called a wen or sebaceous cyst, is a sac-like growth filled with sebum, typically found on the scalp, neck, or back. A steatoma is a true cyst, not a surface blemish, and it is not something an esthetician may lance, extract, or otherwise treat — it requires medical or surgical evaluation.

Sudoriferous Gland Disorders

Sweat gland disorders are tested in smaller numbers but appear reliably because they connect directly to the eccrine/apocrine gland facts covered in the previous section.

Bromhidrosis occurs most often in the underarm and groin areas, where apocrine glands are concentrated, because bacteria break down apocrine secretions into odor-producing compounds. Anhidrosis is a more serious medical condition, since it removes the body's ability to cool itself through perspiration and can be a sign of an underlying disease or nerve dysfunction. Hyperhidrosis is uncomfortable and can complicate services that rely on adhesives or precise product placement, such as certain masking or lash procedures, and severe cases should be discussed with a physician. Miliaria rubra develops when sweat ducts become obstructed, trapping perspiration under the skin and producing small, itchy, inflamed papules or vesicles, most common in hot, humid environments or under occlusive clothing.

Scope-Of-Practice Decision Making

The exam frequently tests whether a candidate can distinguish a condition an esthetician may service from one that requires referral. A useful decision rule: conditions confined to the surface layers, without signs of deep cyst formation, active infection, or systemic disease, generally sit within scope with proper technique (comedones, milia, mild seborrhea, sebaceous hyperplasia observation). Conditions involving true cysts (steatoma), significant inflammation with risk of scarring (cystic/nodular acne), or abnormal physiological function (anhidrosis, severe hyperhidrosis) call for medical referral rather than an esthetic service attempt.

Worked Scenario

A client arrives with several small, hard, pearly bumps clustered under both eyes and reports they have not changed in appearance for months. This description matches milia, a condition within many estheticians' scope to gently address with proper technique and sanitation. If the same client instead had a soft, mobile, fluid-filled lump on the scalp that has grown larger over the past year, the correct identification is a steatoma, and the correct professional response is referral to a physician rather than attempted extraction, since a true cyst can become infected or require surgical removal.

Documentation Supports Safe Judgment Calls

Every sebaceous or sudoriferous finding worth noting should go on the client's intake or treatment record: location, approximate size, duration if known, and whether the client reports pain, rapid growth, or bleeding. A steady, unchanging patch of sebaceous hyperplasia noted at three consecutive visits supports continuing routine service, while a new note that a lesion has become tender, larger, or has started bleeding is a clear signal to pause services in that area and recommend the client see a physician before the next appointment. Building this habit protects the client, creates a defensible record for the esthetician, and mirrors the kind of scenario reasoning the current theory exam rewards over simple term memorization.