Humidity Is the Main Culprit
The simplest answer for that extra shine is the spike in humidity. [3, 14] During the monsoon, the air is saturated with water vapour. Under normal conditions, the sweat your body produces evaporates, helping to cool you down and remove impurities. However,
when the air is already humid, this evaporation process slows down dramatically. [14] As a result, sweat sits on your skin's surface for longer, mixing with your skin's natural oil (sebum), dirt, and pollutants, creating that sticky, greasy film we all know too well. [14, 10]
Your Oil Glands Go Into Overdrive
High humidity and warmer temperatures signal your sebaceous glands to ramp up sebum production. [1, 2, 3] Your face has the highest concentration of these glands, which is why it's often the first place you'll notice that extra sheen. [2] Research confirms that sebum secretion increases in hotter, more humid environments. [1] This overproduction means more oil is available to clog pores, which can lead to breakouts and blackheads, a common complaint during the rainy season. [5, 12, 10]
A Breeding Ground for Bacteria
The combination of excess sweat and oil creates the perfect warm, moist environment for bacteria to thrive. [6, 10] This can disrupt your skin's natural balance and pH levels, weakening its protective barrier. [11] When acne-causing bacteria like *Propionibacterium acnes* proliferate in these conditions, it can trigger inflammation, pimples, and other skin infections, making monsoon a challenging time for those with acne-prone skin. [5, 10]
Cleanse Gently, But Consistently
While it might be tempting to wash your face repeatedly or use harsh scrubs to combat the oiliness, this can backfire. Stripping your skin of its natural oils can irritate it and trigger even more sebum production as your skin tries to compensate. [1, 8] Instead, stick to a gentle, pH-balanced, or foaming cleanser and wash your face twice a day—morning and night—and after sweating. [3, 4, 11] Look for cleansers with salicylic acid, a beta-hydroxy acid (BHA) that is oil-soluble and can penetrate pores to clear out congestion. [7, 13]
Don't Skip the Moisturiser
A common mistake is skipping moisturiser, believing that oily skin doesn't need it. However, hydrated skin is healthy skin. [8] When your skin is dehydrated, it can actually produce more oil to make up for the lack of moisture. [5, 15] The key is to switch from heavy winter creams to lightweight, non-comedogenic (meaning it won't clog pores) formulas. [1, 6] Gel-based or water-based moisturisers with ingredients like hyaluronic acid or glycerin are excellent choices, as they provide hydration without adding extra grease. [9, 18]
Incorporate Key Active Ingredients
Certain ingredients are particularly helpful during the monsoon. Niacinamide (a form of Vitamin B3) is a superstar for regulating oil production, reducing inflammation, and minimizing the appearance of pores. [7, 11] Clay masks, used once or twice a week, are fantastic for absorbing excess sebum and drawing out impurities from the pores. [4, 17] Finally, even on cloudy monsoon days, UV rays are present. Always finish your morning routine with a lightweight, broad-spectrum sunscreen to protect your skin without contributing to the greasy feeling. [1, 11]
