What is a common aftercare instruction after a facial treatment?

After a facial treatment, it is essential to avoid sun exposure and use sunscreen. This is because facial treatments often involve the use of products and techniques that can make the skin more sensitive, particularly to UV radiation. Protecting the skin from the sun helps prevent issues like hyperpigmentation, irritation, and premature aging that can arise from sun exposure on freshly treated skin.

Using sunscreen not only protects the skin but also helps retain the benefits of the facial treatment by shielding it from harmful rays, allowing for a better recovery and longer-lasting results. The combination of sun protection and aftercare significantly enhances the effectiveness of the treatment and helps maintain healthy skin.

In contrast, using heavy makeup could clog the pores and interfere with the skin's natural healing process. Applying skincare products immediately might not be beneficial as the skin may need time to absorb and recover post-treatment. While increasing water intake is generally good for overall health and can have slight benefits for skin hydration, it does not address the immediate protective needs of the skin after a facial procedure. Thus, emphasizing sun avoidance and sunscreen use is particularly critical in aftercare.