The pits behind the ears may be associated with developmental abnormalities, rupture of the 1st gill groove cyst infection and fistula formation.
1. Developmental abnormalities: in some people, during the developmental process, due to the poor function of the eustachian tube, causing uneven air vaporization of the mastoid process, or during sleep, the mastoid process is compressed, resulting in a concave pit behind the ear.
2. 1st gill groove cyst infection rupture formation of fistula: this disease is the embryonic development process, the 1st gill groove developmental abnormality and formation. The cyst appears as a mass behind the ear and ruptures into a fistula as a result of secondary infection. After the infection is controlled, it can heal into a fistula and appear as a small concave pit behind the ear.
When a dimpled pit behind the ear is found, it is important to seek medical attention and systematic examination to make a definitive diagnosis.