I didn't use any whitening products nor exfoliate it. Now how can i get rid of this darkness around my armpit ?

You may use the gel on that area and exfoliate 1 to 2 times a week. This will help to remove the dead skin cells while brightening up the area.

. Can i use it twice a day on my dark elbow and knees? ? Can i put lotion on top of it? What is best to use, brightening serum or gel?

This product should be used only at night and in the morning you should use Sunscreen. You may use this on stubborn areas and then apply the body lotion over it. We do not recommend that you mix up the products together this may dilute the body lotion and may not work properly.

I stopped using carrotis gel coz i ended up having dark spots both in my arms surrounding the armpit. Whats the best thing to do?

Hello, Thank you for contacting us! We advise that you use the Carotis products at night and in the morning protect the skin with Sunscreen SPF 50 or higher. If you wish to use a moisturizer also it should be a none lightening moisturizer. There are 3 reasons why the skin becomes darker during a lightening treatment. One of the biggest mistakes is using your lightening products during the day, (lightening/brightening products make the skin sensitive to sunlight) therefore it can result in the skin becoming darker overtime. The 2nd reason is not wearing sunscreen every morning to protect even skin tone. The 3rd reason is over exfoliating with exfoliating soaps. You should exfoliate 2 times a week skipping 3 to 4 days between exfoliating.

I have a skin care routine containing vitamin C, retinol etc including an at home laser around my eyes. Can this be used with the other products?

This is a Hydroquinone free product that can help you even out the skin. You should use this at night and in the morning, you should use sunscreen. Should you want to add this product to your regimen you should first try it in a small area and allow 24 hours to see results. If skin reacts good to the added product to your regimen you can continue using the product. Always remember not to over exfoliate the skin and use sunscreen everywhere that is exposed to the sun.