To help get rid of the red marks from old pimples, you can consider the following options:

1. Topical Treatments: Use over-the-counter creams or gels containing ingredients like retinoids, vitamin C, niacinamide, or hydroquinone. These can help fade red marks and promote skin healing.

2. Chemical Peels: Dermatologists can perform chemical peels to exfoliate the skin and improve its appearance by reducing redness and promoting skin regeneration.

3. Microdermabrasion: This procedure helps to exfoliate the skin gently, improving its texture and appearance.

4. Laser Therapy: Intense Pulsed Light (IPL) or laser treatments can target the redness in the skin and promote collagen production, improving the appearance of red marks.

5. Microneedling: This treatment involves creating tiny injuries in the skin with fine needles, triggering the skin’s natural healing response and reducing redness over time.

It’s important to consult a dermatologist to determine the best treatment options for your specific skin concerns and to ensure the safety and effectiveness of the chosen treatment.