Buried penis (also known as hidden penis or retractile penis) is a congenital or acquired condition in which the penis is partially or completely hidden below the surface of the skin. A buried penis can lead to urinary difficulties, poor hygiene, infection, and inhibition of normal sexual function. Buried penis is different than micropenis, which is an abnormally small, normally structured penis with a stretched penile length of less than 2.5 standard deviations below the mean for age or stage of sexual development of the patient. History Buried penis was first described by Edward Lawrence Keyes in 1919 as the apparent absence of the penis due to the penis being buried beneath the skin of the abdomen, thigh, or scrotum. Further research was done by Maurice Campbell in 1951, when he reported on the penis being buried beneath subcutaneous fat of the scrotum, perineum, hypogastrium, and thigh. Causes Congenital Congenital causes can include the maldevelopment of the penile shaft with a lack of attachments of the shaft skin to the penile shaft. While rare, it can include an abnormally large pubic fat pad and firm tissue that pulls the penis inward. Acquired Obesity While not every obese male has the buried penis condition, 87% of men that received surgical treatment for buried penis were reported to be obese. Significant overlying abdominal fat can also create an environment that encourages bacterial and fungal growth. Obesity can also increase the likelihood of the development of type II diabetes mellitus, which is characterized by increase susceptibility to infections, making it difficult to successfully and promptly manage the buried penis condition. Such recurring infections can also lead to scar contracture, which can cause the prepubic skin to shift over the shaft and glans, thus invaginating the shaft's skin and leading to a buried penis. Penoscrotal lymphodema While an uncommon cause, penoscrotal lymphodema causes a deformity of the shaft and scrotum, resulting in a buried penis. Overly aggressive circumcision In some cases of circumcision, too much foreskin is removed or the suture line constricts, causing cicatricial scarring, which can trap the penis in the remaining foreskin or push the penis into the suprapubic area and lead to a buried penis. Balanitis xerotica obliterans (BXO) BXO is a chronic inflammatory dermatological process that causes sclerosis of the glans, shaft, prepuce, or urethra. This can result in a cicatrix of the distal penis and its entrapment. Dysgenic