There are several potential causes for marks left on your forehead:
- Your headband is too tight. The elastic band should be stretchy enough to fit all head sizes (until 610 mm). For more informations on putting your headband on, go visit our dedicated article "putting your headband on".
- Your front band is dirty. The headband should be worn with a clean face and hair. Accumulation of dirty residue on sections of the headband that contact your skin increases the risk of damage to the device. To ensure that your headband stays in the best possible condition, read the article "Cleaning and maintenance of your headband".
- Allergies. In extremely rare cases, allergic reactions to the material used in your headband may occur. If this occurs, contact our support services immediately.