Introduction Summer is considered one of the seasons that most affect the skin due to increased exposure to ultraviolet (UV) radiation, along with high temperatures and humidity. These factors lead to physiological and pathological changes in the skin, increasing the likelihood of pigmentation, dryness, premature aging, and other disorders. Ultraviolet Radiation and Its Effects Ultraviolet rays are divided into: UVA: Penetrates the dermis and causes skin aging UVB: Affects the epidermis and causes burns and pigmentation These rays lead to: Stimulation of melanin production Breakdown of collagen and elastin fibers Increased oxidative stress Effect of Heat and Humidity High temperatures lead to: Increased sebum (oil) production Enlarged pores Increased bacterial growth Excessive sweating may also cause: Clogged pores Acne breakouts Dehydration and Water Loss Despite sweating, dehydration may occur due to water loss without adequate replacement, leading to: Weakening of the skin barrier Increased sensitivity ظهور الخطوط الدقيقة (appearance of fine lines) Clinical Application During summer, it is recommended to: Reduce aggressive procedures (such as deep chemical peels) Use sunscreen Keep the skin moisturized Avoid direct sun exposure Conclusion Summer represents a major risk factor for skin health and requires continuous preventive care to maintain skin radiance and prevent complications. Prepared by: Dr. Haider Riyadh Abbis AL_mustaqbal University is the first university in Iraq