What Does A Hole In The Chest Indicate?

Greetings, I am 24yrs of age, 5sum in height and I am not sure about my weight but I am in good medical condition. I ve recently found out that they call the little hole on the ear preauricular sinus or something to that effect. I have a little hole in my chest, what I would like to know is, is it the same thing? Thus far, I ve had no trouble with it except when something bit/stung me and it started to swell and hurt and what not. Other than that, no troubles. A single hair also grows out of it. I doubt its harmful but can you tell me what it is?