Name a common sensitizing agent found in skincare products.

Fragrance is recognized as a common sensitizing agent in skincare products due to its potential to provoke allergic reactions and irritation in sensitive individuals. Fragrance compounds—often made from a complex mixture of natural and synthetic ingredients—can cause contact dermatitis and exacerbate skin conditions such as eczema or rosacea.

On the other hand, alcohol can also be irritating, especially in high concentrations, but it is not classified specifically as a sensitizing agent for the broader population. Aloe vera is generally known for its soothing and healing properties, making it unlikely to cause sensitization. Glycerin is a humectant that attracts moisture, typically well tolerated by most skin types, and is not associated with sensitization. In the realm of sensitive skin and allergy considerations, fragrance stands out as a notable agent to be aware of.