Yes, masks can have side effects, depending on the type of mask, material, and individual skin types. Some common side effects include:

1. Skin irritation or allergic reactions
2. Respiratory issues (e.g., difficulty breathing)
3. Discomfort or claustrophobia
4. Acne or skin breakouts
5. Redness or irritation around the eyes
6. Dryness or chapping of the skin
7. Headaches or dizziness (in rare cases)

It's essential to choose a mask suitable for your skin type and needs, follow proper usage instructions, and remove the mask as directed to minimize potential side effects. If you experience any discomfort or adverse reactions, discontinue use and consult a healthcare professional or dermatologist.