I have a burning sensation on my scalp and face?

It depends on exam: It all truly depends on your skin examination and history. The likely possibilities are a phototoxic reaction due to sun exposure brought about by use of medications (ex. Nsaids), some herbs (such as st. John's wort), or prescription medications (notably some blood pressure medications). Rarely, the cause could be autoimmune skin conditions. Eitherway, a visit to your derm is needed for proper rx.