Addressing different skin issues requires understanding their unique causes and selecting the right ingredients. For example, dark circles often stem from hyperpigmentation or thin skin, where Vitamin C and Retinol help by brightening and enhancing skin turnover. Salicylic acid can clear pores and exfoliate dead skin cells, which may indirectly improve the skin's appearance under the eyes. For those dealing with fungal acne, which is caused by yeast rather than typical bacteria, antifungal agents like Ketoconazole are effective in reducing inflammation and controlling fungal growth. It's important to avoid heavy oils or acne products that exacerbate this condition. Milia, small white bumps on the skin, result from trapped keratin. Regular use of retinoids can promote cell turnover and prevent these cysts from forming. Puffy under eyes often occur due to fluid retention or inflammation. Applying products with caffeine or green tea can constrict blood vessels and reduce swelling, giving a refreshed appearance. Skin congestion caused by buildup of dead skin cells and excess oil responds well to gentle exfoliants like lactic acid and glycolic acid, which dissolve dead skin without causing irritation. From my personal experience, consistency is key when incorporating these ingredients. Start with lower concentrations and patch test to avoid irritation. Combining these solutions tailored to your skin concerns can lead to noticeable improvements. Always complement topical treatments with good hydration, adequate sleep, and a healthy diet to support overall skin health.