Certainly, addressing scars and dark spots requires a targeted approach that involves specific ingredients known for their efficacy in these areas. Here are some ingredients to look for in serums:

1. Vitamin C: This potent antioxidant is known for its brightening properties. It can help fade dark spots and hyperpigmentation by inhibiting the enzyme tyrosinase, which is responsible for the production of melanin in the skin.

2. Retinol: A derivative of Vitamin A, retinol is renowned for its ability to accelerate skin cell turnover. This process helps to shed the top layer of skin cells, revealing fresher, less pigmented cells underneath, which can help reduce the appearance of dark spots and scars.

3. Niacinamide: Also known as Vitamin B3, niacinamide is a powerhouse ingredient that can help reduce inflammation, lighten dark spots, and improve the elasticity of the skin.

4. Alpha Hydroxy Acids (AHAs): AHAs like glycolic acid and lactic acid are chemical exfoliants that help to remove the top layer of dead skin cells, promoting the growth of new, healthier skin. This can help to fade scars and dark spots over time.

5. Hydroquinone: This ingredient works by decreasing the production and increasing the breakdown of melanin pigments in the skin. This can result in the lightening of dark spots.

6. Licorice Root: A natural alternative, licorice root contains a compound called glabridin, which inhibits pigmentation, helping to lighten dark spots and even out skin tone.

Remember, consistency is key when using these products. It may take several weeks to months to notice a significant improvement. Also, it's crucial to use a broad-spectrum sunscreen during the day, as many of these ingredients can make your skin more sensitive to the sun. Always patch test new products to ensure they don't cause irritation or allergic reactions.