According to Doctor Nguyen Thi Viet Ha, of Tam Anh Cau Giay General Clinic, skin must work harder in summer to adapt to the environment due to high temperatures and strong ultraviolet rays. When skincare is done incorrectly, increased sweat and sebum make skin vulnerable, creating conditions for acne, melasma, hyperpigmentation, and premature aging.

**Over-washing the face daily**

Oily skin in summer prompts many to wash their face continuously or switch to stronger cleansers for a clean, dry feeling. However, excessive washing removes the natural lipid layer on the skin's surface. When this protective layer is compromised, the skin becomes dry externally but increases oil production internally, creating a favorable environment for bacteria, leading to breakouts and increased sensitivity to sunlight.

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**Abusing exfoliation or chemical peels**

Exfoliating two to three times each week or using high-concentration chemical peel products at home to brighten skin in summer can erode and thin the protective stratum corneum. This makes skin more prone to sun damage and hyperpigmentation.

**Skipping moisturizer**

During hot weather, increased sweat and sebum often lead people to believe moisturizing is unnecessary. However, this condition actually dehydrates the skin, causing sebaceous glands to overcompensate by producing more oil. This results in shiny, congested pores and breakouts. Maintaining a moisturizing cream is essential to balance the skin, reduce oil secretion, and strengthen the skin's protective barrier against the effects of heat.

**Insufficient sun protection**

Many apply sunscreen only one time in the morning or use too little. Sunscreen requires adequate application and reapplication every 2-3 hours, especially when outdoors or sweating heavily. Relying solely on sunscreen without physical barriers like hats, masks, or UV-protective clothing is not enough.

**Applying heavy makeup**

When skin darkens or becomes prone to acne in hot weather, applying a thicker foundation to cover blemishes is a mistake. Sweat and oil clog pores, causing acne to flare up. If makeup is not thoroughly removed at the end of the day, residual cosmetics can lead to inflammation and irritation.

Doctor Ha advises against self-prescribing "quick whitening" or "rapid melasma treatment" products found online. These products often contain corticosteroids or strong abrasives, which quickly whiten skin in the short term but, long-term, thin and weaken the skin, making it more susceptible to sun damage and severe hyperpigmentation.

**Neglecting sun protection after laser treatments**

Individuals undergoing high-tech treatments for acne, melasma, or skin aging who practice incorrect summer skincare may reduce treatment effectiveness. Modern laser devices like Fotona StarWalker or Fotona Dynamis, available at the Department of Dermatology and Aesthetics, Tam Anh General Hospital system, selectively target pigments or regenerate skin without surface damage. However, without proper sun protection and skincare, pigmentation can return.

**Staying too long in air-conditioned rooms**

Many avoid sweating by staying in air-conditioned rooms continuously. Dry air from air conditioners rapidly dehydrates skin, making it rough and easily irritated. Without sufficient water intake and moisturizing, skin can experience prolonged dehydration.

Doctor Ha recommends that skincare in hot weather focuses on skin protection and balance. Adequate cleansing, proper moisturizing, and full sun protection help limit skin erosion.

Thanh Ba