It is generally advised to wait at least 48 hours after a microneedling session before using red light therapy. This allows your skin enough time to heal and recover from the procedure, as well as reducing the risk of possible adverse effects from the combination of treatments. Using red light therapy too soon could lead to increasing the risk of hyperpigmentation, irritation or inflammation. It is important to speak to your doctor to find out how soon after microneedling it is safe for you to use red light therapy. In some cases, a doctor may recommend waiting up to 72 hours before using red light therapy.