Hi XXXXXXX
Thanks for writing to us.
The brown patches on your chest could be fungal infection, pityriasis versicolor, post inflammatory hyperpigmentation etc. I would be in a better position to answer if you could upload an image of concerned area.

As far as dark circles are concerned
Improve sleeping pattern, take at least 8 hours sleep
Avoid visual strain from TV laptop
Get your HB and thyroid profile done as anemia and thyroid disorder can lead to dark circles
Take nutritious diet
Apply wundereye cream twice in a day
Youmay also take arginine, Kojic acid or Glycolic acid peels to reduce your dark circles.
Dark circles take long time to respond, so you have to be patient.
Take care

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Hi XXXXXXX
Thanks for uploading the image. I have gone through the attached images. Though the images are not very clear but the lesions look slightly greyish or slate blue in color. The cause for such pigmentation could be lichen planus pigmentosus, use of fragrant cosmetics/ perfumes( berloque pigmentation) and very rarely in your case becker's nevus as this nevi usually presents in adolescence or teenage. Sometimes drugs like antibiotics, painkillers too can cause sensitivity and pigmentation.
I would advise that for the pigmentation, you consult a dermatologist nearby so that be properly examining the lesion , an appropriate diagnosis can be made.
In the meanwhile, you may apply pigmentation reducer cream like skinlite over the lesion in night.

Hope that helped.
Take care

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