Expired makeup can have different effects on various skin types. These effects are primarily due to the breakdown of the active ingredients in the makeup and the growth of bacteria over time.

1. Dry Skin: Dry skin is already prone to flaking and irritation. Using expired makeup can exacerbate these conditions. As the moisturizing agents in makeup degrade over time, they can lose their effectiveness, making the makeup drying on the skin.

2. Oily Skin: Expired makeup, especially those with oil-based ingredients, can lead to blocked pores and acne breakouts. Over time, the oils in makeup can oxidize and become rancid, which can irritate the skin and cause inflammation and breakouts.

3. Sensitive Skin: Those with sensitive skin are particularly at risk when using expired makeup. The breakdown of ingredients can lead to an increase in skin irritation, redness, and allergic reactions.

4. Normal Skin: Even if you have normal skin, using expired makeup can still cause issues. The degradation of preservatives in makeup can allow bacteria and mold to grow, which can lead to skin infections and acne.

5. Combination Skin: For those with combination skin, the effects of expired makeup can be a mix of the above, depending on the areas of dryness or oiliness.

To avoid these issues, it's essential to keep track of when you open your makeup products and to follow the recommended usage life indicated by the Period After Opening (PAO) symbol, usually a jar icon with a number indicating the number of months the product is safe to use after opening. Also, always store your makeup in a cool, dry place away from direct sunlight to help preserve its lifespan.