The age of 20s ...
The most common issues is acne. To avoid this problem is to keep your neck, chest, and hands along with your face protected with sunblock.
Step 1: Wash your face gently to remove makeup and excess oil, but won't dry out your skin.
Step 2: Pick a light moisturizer that provides UVA and UVB protection.
Step 3: If you get a mild acne, use salicylic acid or benzoyl peroxide.
Step 4: Apply serum vitamin C daily, it will prevent the damage from free radical.
Step 5: Choose a mild moisturizer