<s>[INST] hello, I am lightskin however my underbutt, inner thighs knees elbows and other creases tend to be a darker bluish colour. Is there any remedy to this? Ive tried, exfoliating, lemon, honey, and even tone cream but nothing seems to work. Please help. thanks. [/INST] Hello and Welcome to ‘Ask A Doctor’ service. I have reviewed your query and here is my advice. Darker skin creases or body folds, such as neck, axilla, groin folds, and elbows are commonly seen in a condition known as Acanthosis nigricans. It is due to insulin resistance causing the skin to turn darker and thickened—velvety textured in body folds. Acanthosis nigricans is more common in obese/overweight individuals and is due to underlying insulin resistance. I suggest you to address weight issues if that is a factor in your case. For the skin I suggest you to use Tretinoin 0.025% cream once every night for a few weeks. Hope I have answered your query. Let me know if I can assist you further. Regards, Dr. Kakkar S. </s>