<human>: How do I know if a tan is too dark?
<bot>: If you're concerned about the color of your skin, it's always best to consult with a dermatologist. However, in general, a darker-than-usual tan can be an indication that your body is not producing enough vitamin D, which may lead to health problems such as depression and fatigue. You should also avoid using tanning beds or sun lamps, as these are dangerous for your skin.