Which of the following is a contraindication for an AHA treatment?

Accutane, also known as isotretinoin, is a powerful medication used primarily for severe acne treatment. One of its known side effects is significant skin sensitivity, which can lead to increased irritation and adverse reactions when combined with chemical exfoliants like alpha hydroxy acids (AHAs). Since AHAs work by exfoliating the upper layers of the skin, using them on individuals currently undergoing treatment with Accutane poses a risk of over-exfoliation and can exacerbate skin irritation or lead to further complications, such as redness, peeling, or a compromised skin barrier.

In contrast, the other options, such as Vitamin C serums, hydroquinone, and salicylic acid, do not inherently present the same level of risk when used with AHA treatments and can, in many cases, be used safely under professional guidance. However, it's always important for estheticians to evaluate the client's overall skin condition and treatment history before recommending or performing any procedures.