Along with fibroma they are benign changes. The cause is unknown but genetics and long sun exposure are considered to be the main reasons for their development. Some connect them with HPV virus. They appear after the age of 30 and are incorrectly called age warts although they are typical for middle age as well.
These changes have a strictly aesthetic role. Usually they look like light brown pigmentation in skin level which grow bigger with time and become more thick and have a crude surface. Lasers which remove pigmentation are used for initial stages. Method of choice for removing forms above skin level are erbium and Co2 lasers which remove the formations mechanically. The treatment is painless and isn't uncomfortable. Usually 1 to 2 treatments are needed to remove them completely. Destroyed forms do not return but new ones can appear so maintenance treatments are needed. To people with a genetic predisposition we recommend preventive measures because they can affect the whole body. Usually they appear on one's face, neck, torso and fists. Other methods which are used for their removal are burning with electricity, freezing, scratching and other.