Fractional ablative carbon dioxide laser resurfacing is a frontline treatment for acne scars. It creates multiple microscopic treatment zones to accelerate the collagen formation and the healing process of reepithelialization, according the principle of fractional photothermolysis. At present, the fractional CO2 laser with a wavelength of 10,600 nm is commonly used in the field of cosmetology and clinical therapies for various skin diseases, and it can effectively improve skin regeneration and scar formation. To obtain satisfactory results for patients with scars, repetitive fractional laser therapy is always required; however, this treatment could easily lead to complications such as erythema, edema, infection, and post‐inflammatory hyperpigmentation. In addition, different types of acne scars may have different responses to laser, further limiting its widespread use. In recent studies both home and abroad, a new pattern of fractional laser combined with other therapies to improve acne scar has been recommended to guarantee the safety and effective of treatment. This article reviews the recent pertinent literatures and summarized the progression of ablative fractional CO2 laser combined with other therapies on acne scar.

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Striae distensae (stretch marks/striae gravidarum) is one of the common cosmetic problems that can cause psychological distress and anxiety to patients due to its disfiguring damage, especially for women. The etiology of striae distensae is currently unknown, and risk factors include low maternal age, family history of stretch marks, excessive weight gain during pregnancy, and high neonatal weight. This article reviews the latest literature on the most commonly used, most popular, and novel treatment modalities and analyzes the hot spots and difficulties in striae distensae treatment in recent years. Topical treatment modalities are mainly used as an adjunctive treatment. Ablative lasers and non-ablative lasers are the most popular, among which picosecond has been tried in striae distensae treatment in the last two years. Combined treatment modalities are currently a hot spot for SD treatment, and microneedle radiofrequency and fractional CO 2 laser combined with other treatments are the most common. Microneedle radiofrequency is the most commonly used and achieved therapeutic effect among the combined treatment modalities.

Acne is a kind of chronic inflammatory skin disease, which is common in the hair follicle and sebaceous gland of teenagers. It often recurs and affects the quality of life of patients. Acne itself can cause the damage of skin barrier function. On the other hand, common acne treatment methods, such as external drugs, systemic drugs, physical, and chemical treatment, can also lead to the damage of skin barrier function and affect the treatment effect. The application of skin care in the adjuvant treatment of acne has been widely concerned. Due to their high safety, good tolerance, and the effect of improving the damaged skin barrier, medical skin care products are a hot spot in the treatment of cosmetic skin diseases in recent years. It can not only increase the curative effect, reduce the side effects, but also increase the compliance of patients when combined with conventional acne treatment. In this article, skin care products and their application in acne treatment were reviewed.