Hello,
The finger nails grow from a small area of special cells at the origen of the nail. Unfortunately, if these cells are destroyed the nail will not re-grow. From your symptoms it looks like superficial burn of the finger nail which should soon regrow.
It is very difficult to precisely confirm a diagnosis without examination and investigations and the answer is based on the medical information provided. For exact diagnosis, you are requested to consult your dermatologist. I sincerely hope that helps. Take care and please do keep me posted on how you are doing.