4.5 Glands, Sebum, Sweat, and Follicles

Oil and Sweat Are Different

The NIC outline includes histology and physiology of the skin, including glands and skin functions. Estheticians should clearly distinguish sebaceous glands from sudoriferous glands. This distinction shows up in questions about oil, sweat, acne, hydration, body odor, and temperature regulation.

Sebaceous glands produce sebum, an oily substance that lubricates the skin and hair. These glands are often connected to hair follicles. Sebum helps reduce water loss and keeps the surface flexible, but excess oil can contribute to shine and clogged follicles. Too little oil can leave skin feeling dry or tight, although dryness can also come from lack of water in the stratum corneum.

Sweat Glands

Sudoriferous glands produce sweat. Sweat helps cool the body through evaporation and supports excretion of small amounts of waste substances. Two broad sweat-gland categories are commonly taught: eccrine and apocrine. Eccrine glands are widely distributed and are important for temperature regulation. Apocrine glands are associated with areas such as underarms and become more active around puberty.

Sweat itself is not the same as oil. This is an exam trap. A client can be oily and dehydrated, dry and sweaty, or combination in different facial zones. Skin analysis should look at oil production, water content, texture, sensitivity, lesions, and contraindications.

Follicles and Services

A follicle is a tube-like structure in the skin associated with hair growth. Sebum can move through follicles to the skin surface. When dead cells, oil, and debris accumulate, follicles may appear congested. Estheticians may perform cleansing, exfoliation, steaming, and extractions within scope, but they should not treat infectious or severe medical acne as if it were a routine cosmetic issue.

Waxing and tweezing also involve follicles. Removing hair can irritate the follicle and surrounding skin. Contraindications, sanitation, proper technique, and aftercare help reduce risk.

Oil and sweat also affect product selection. Heavy occlusive products may feel uncomfortable on very oily areas, while harsh degreasing can make a compromised barrier worse. A sweaty client may need cooling, drying, or rescheduling depending on the service. The safest choice follows skin analysis rather than assumptions.

Exam Application

If the question asks what produces sebum, choose sebaceous gland. If it asks what produces sweat, choose sudoriferous gland. If it asks why steaming can help before extractions, connect it to softening sebum and surface debris, not sterilizing the skin.

Gland activity can be affected by hormones, age, climate, products, medication, and health conditions. The esthetician observes and adjusts within scope. When signs suggest infection, uncontrolled inflammation, or a medical disorder, referral is appropriate.