When it comes to choosing blush sticks for sensitive skin, there are several key factors to consider.

1. **Ingredients**: The first thing to look for is the ingredient list. Avoid products that contain harsh chemicals, synthetic fragrances, and artificial dyes, as these can cause irritation and inflammation. Instead, opt for blush sticks that are formulated with gentle, natural ingredients. Ingredients such as chamomile, aloe vera, and green tea are known for their soothing properties and are less likely to cause a reaction.

2. **Hypoallergenic**: Hypoallergenic products are designed to minimize the risk of allergic reactions. While no product can guarantee that it won't cause an allergic reaction, hypoallergenic blush sticks are a safer choice for those with sensitive skin.

3. **Non-comedogenic**: Non-comedogenic products are formulated to not block pores, which can lead to breakouts. This is particularly important if you have sensitive and acne-prone skin.

4. **Fragrance-Free**: Fragrances, even those derived from natural sources, can be irritating to sensitive skin. Look for blush sticks that are fragrance-free to minimize the risk of irritation.

5. **Certifications**: Look for products that are certified by reputable organizations. Certifications like ECOCERT, COSMOS, or the Leaping Bunny logo can give you peace of mind that the product is free from harmful ingredients and is cruelty-free.

6. **Reviews and Recommendations**: Lastly, consider the experiences of others with similar skin types. Reviews and recommendations can provide valuable insight into how a product performs on sensitive skin.

Remember, everyone's skin is unique, and what works for one person might not work for another. It's always a good idea to patch test a new product before applying it to your face to ensure it doesn't cause a reaction.