Sensitive skin can react adversely to certain ingredients commonly found in bronzer sticks. If you have sensitive skin, it's crucial to avoid the following ingredients:

1. Fragrance: This is one of the most common causes of skin irritation and allergic reactions. Fragrance can be composed of many different ingredients, some of which can be harmful to sensitive skin.

2. Parabens: These are used as preservatives in many cosmetic products, but they can cause skin irritation and allergies in some people. They are also suspected to interfere with the body's hormones.

3. Talc: This ingredient is used in many cosmetic products for its ability to absorb oil and provide a smooth application. However, it can clog pores and cause breakouts, especially in people with sensitive skin.

4. Bismuth Oxychloride: This is a common ingredient in mineral makeup, including some bronzer sticks. It can cause itching, rashes, and skin irritation.

5. Phthalates: These are used in cosmetics to increase flexibility and softness, but they can cause skin irritation and are also suspected to disrupt the endocrine system.

6. Mineral Oil: This ingredient can clog pores and lead to breakouts, especially in people with sensitive or acne-prone skin.

7. Synthetic Dyes: These can cause skin irritation and allergic reactions. Look for products labeled as "free of synthetic dyes" or "dye-free."

8. Silicones: While they give a smooth application, they can trap debris in your pores, leading to breakouts.

Remember, everyone's skin is different. What irritates one person's skin might not bother another's. It's always a good idea to do a patch test when trying a new product.