Combination skin describes a pattern where different areas of the face behave differently — most commonly an oilier T-zone (forehead, nose, and chin) with normal to dry cheeks.

This pattern is primarily determined by genetics, but is influenced by hormones, environment, and skincare choices.

The key contributing factors include:

• Genetic sebum distribution
  The most significant driver of combination skin is genetics. Oil glands are naturally more concentrated and active in the T-zone, while the cheeks tend to have fewer, less active sebaceous glands. This creates inherent oil imbalance across the face.
  
• Hormonal
  Androgens regulate sebum production. Hormonal fluctuations — including menstrual cycles, perimenopause, stress, or life-stage changes — can increase oil output in the T-zone without affecting drier areas.
  
• Environmental conditions
  Heat and humidity can intensify oiliness in the T-zone, while cold or dry climates often worsen dehydration in the cheeks. Stress-related cortisol elevation may further stimulate oil production in predisposed areas.
  
• Inappropriate skincare
  While not the root cause, skincare choices can exaggerate imbalance.
  
  Using harsh or stripping products to control oil can dehydrate the cheeks, while heavy creams applied across the entire face may clog pores in the T-zone. Skipping moisturiser can also prompt the skin to overproduce oil in response to dehydration.
  

Combination skin is not a flaw or disorder — it reflects natural variation in sebaceous activity across the face. With the right approach, the different zones can be balanced effectively without over-treating or compromising the skin barrier.