as you may know the internet poses an obvious barrier when trying to make a blind diagnostic decision without the ability to examine your toe first-hand. i have removed zillions of toenails in my medical career and yes you can have some areas under the remaining nail turn brownish. this is usually older blood that is being reabsorbed by the body. if your toe is red hot and tender then these would be a sign of an infection. when in doubt it is perfectly fine to contact the medical provider that performed this procedure for post-surgical advice.
got surgery to remove ingrown toenail & it is looking better; but the area & underneath are turning a brownish color. i am 20 years old & had been dealing with an infected ingrown toenail for a few months. i got surgery to remove the side of the nail a few days ago & it is looking better; however the area & underneath my nail are turning a brownish color. is it infected again or is this part of the healing process or something else entirely?