Which of the following is critical for patient aftercare post-laser treatment?

Applying sunscreen to protect the treated area is essential for patient aftercare following laser treatment due to the increased sensitivity of the skin after such procedures. Laser treatments can make the skin more susceptible to UV damage, leading to complications such as hyperpigmentation or even burns if exposed to sunlight without protection. Therefore, using sunscreen helps shield the skin from harmful UV rays, promoting healing and preventing adverse effects.

The other options do not align with the necessary self-care practices for a patient recovering from laser treatment. For instance, avoiding moisturizers entirely can lead to dryness and irritation, while wearing heavy makeup may irritate the treated area, potentially leading to infection or delayed healing. Continuing regular activities without restrictions can also be harmful, as certain activities may exacerbate sensitivity or cause trauma to the skin post-treatment. Thus, applying sunscreen is a vital part of the aftercare regimen to ensure optimal healing and skin protection.