Your residency application is electronic; the applications all look similar in style and content, as the application is entered into ERAS and the format is decided by the computer program. The personal statement is your opportunity to show the program a little bit of your own unique personality.
Students often agonize greatly over what to write, but in the end, the most effective personal statement is a nicely written and grammatically correct statement which highlights your personal strengths and high points. It should reflect your personal career goals and reflect your own personality and style. It doesn't have to be unique or fancy, just an honest statement of
1) Why you are interested in the specialty
2) Why your interests, values, personality and skills are a good fit for the specialty
3) What kind of program would be a nice fit for you
4) Your future career plans in that specialty
A good personal statement is short enough to read easily, has no spelling or grammatical errors, gives a story or two that illustrate or highlight your interest in the specialty, and is interesting and unique to you.
Always have two or three other people review your personal statement--someone who knows you well and can tell if it reflects your personality and a mentor in the specialty who could comment on the content. Always check for spelling errors, grammatical errors!
Tips for Writing a personal Statement