Question: What is (are) Preauricular sinus ?
Answer: Preauricular sinus is a common birth defect that may be seen during a routine exam of a newborn. It generally appears as a tiny skin-lined hole or pit, often just in front of the upper ear where the cartilage of the ear rim meets the face. It may occur on one side (unilateral) or both sides (bilateral) of the ear. Affected people usually do not have any additional symptoms unless it becomes infected. Preauricular sinus may occur sporadically during the development of an embryo or it may be inherited in an autosomal dominant manner with reduced penetrance. Less often, it occurs as a feature of another condition or syndrome. Treatment may include antibiotics for infection and/or surgery to remove the sinus.
Source: GARD

Question: What are the symptoms of Preauricular sinus ?
Answer: What are the signs and symptoms of Preauricular sinus? The Human Phenotype Ontology provides the following list of signs and symptoms for Preauricular sinus. If the information is available, the table below includes how often the symptom is seen in people with this condition. You can use the MedlinePlus Medical Dictionary to look up the definitions for these medical terms. Signs and Symptoms Approximate number of patients (when available) Autosomal dominant inheritance - Preauricular pit - The Human Phenotype Ontology (HPO) has collected information on how often a sign or symptom occurs in a condition. Much of this information comes from Orphanet, a European rare disease database. The frequency of a sign or symptom is usually listed as a rough estimate of the percentage of patients who have that feature. The frequency may also be listed as a fraction. The first number of the fraction is how many people had the symptom, and the second number is the total number of people who were examined in one study. For example, a frequency of 25/25 means that in a study of 25 people all patients were found to have that symptom. Because these frequencies are based on a specific study, the fractions may be different if another group of patients are examined. Sometimes, no information on frequency is available. In these cases, the sign or symptom may be rare or common.
Source: GARD

Question: What are the treatments for Preauricular sinus ?
Answer: How might a preauricular sinus be treated? The majority of preauricular sinuses do not cause symptoms or problems unless they become infected. Common signs of infection include swelling, redness, fluid drainage, and pain. In these cases, treatment typically includes systemic antibiotics. If an abscess is present, it will likely need to be incised and drained. There are differing opinions in the medical literature about the indications for surgical removal of preauricular sinuses. Some believe that even asymptomatic sinuses should be removed. Others believe that surgery is indicated if infection or other complications arise.
Source: GARD