Likely cause
Tanning has so many reasons ranging from increased sun exposure , any vit b12 deficiencies and ifs it since long term other causes to be ruled out.
What to watch for
Warning symptoms like increased neck pigmentation or underarm pigmentation etc has to be watched for.
What you can do
Try to use good sunscreen ( broad spectrum) and moisturizer during night.
When to see a doctor
If u feel it's it's since longterm which is not responding to sunscreen etc ..you require other specialized skin lightening creams and evaluation to rule out any deficiencies.
This is general information from a verified doctor and is not a diagnosis or a substitute for an in-person consultation. In an emergency, seek immediate medical care.
