What is profession?
A profession is a specific line of work - Like in the medical industry you could say the medical profession. The people in a profession typically have education that trains them in the field they choose. We cannot say that we are a professional if we have not a profession.

What is professional?
A professional is a member of a vocation founded upon specialised educational training.
The word professional traditionally means a person who has obtained a degree in a professional field. The term professional is used more generally to denote a white collar working person, or a person who performs commercially in a field typically reserved for hobbyists or amateurs.
Because of the personal and confidential nature of many professional services and thus the necessity to place a great deal of trust in them, most professionals are held up to strict ethical and moral regulations.http://en.wikipedia.org/wiki/Professional.