Which skin type is most likely to react poorly to strong chemical treatments?

Sensitive skin is most likely to react poorly to strong chemical treatments due to its heightened reactivity and lower tolerance to irritants. This skin type often experiences redness, inflammation, and irritation more readily than other types when exposed to harsh ingredients or aggressive treatments. Individuals with sensitive skin may have an impaired skin barrier, which can exacerbate these reactions and lead to discomfort or adverse outcomes.

In contrast, normal, combination, and oily skin types generally have a more robust tolerance to strong treatments. Normal skin often maintains a balanced pH and moisture level, combination skin can handle various products across different areas of the face without significant reaction, and oily skin tends to have excess sebum that can sometimes offer a degree of protection. Thus, sensitive skin's inherent fragility makes it the most susceptible to negative reactions from aggressive chemical processes.