Which product should NOT be started for a client with post inflammatory hyper-pigmentation and sensitivity?

A client with post-inflammatory hyperpigmentation and sensitivity should avoid starting a Vitamin A Corrective Serum. This is because Vitamin A, in its various forms such as retinoids, can be quite potent and potentially irritating to sensitive skin. The active ingredients in these serums often promote cell turnover, which might exacerbate irritation or sensitivity in clients, especially those who are already dealing with post-inflammatory conditions.

In contrast, other options like Mandelic Acid and the lower concentrations of glycolic acid can be gentler and more suitable for sensitive skin. These ingredients are typically less irritating and can help in exfoliation and addressing pigmentation issues without causing excessive irritation. Salicylic acid, while also being effective for certain skin concerns, is generally better suited for oily or acneic skin types but can still provide benefits if used cautiously in sensitive cases. However, Vitamin A should be approached with caution to prevent worsening of irritation or sensitivity in such situations.