Burning sensation in the skin can be possibly caused by a lot of factors including allergies or irritation,
fibromyalgia and niacin toxicity.
If you know that you have taken something you are allergic to,
then treat yourself immediately with anti-histamine drugs.
If you are taking niacin supplements,
then expect as well that the burning sensation in the skin is a usual side-effect.
And if the pain just happened suddenly and continues to persist,
seek for your doctor`s advice as it can lead to serious health problems.