Skin diseases are conditions that affect your skin. These diseases may cause rashes, inflammation, itchiness or other skin changes. Some skin conditions may be genetic, while lifestyle factors may cause others. Skin disease treatment may include medications, creams or ointments, or lifestyle changes. Skin disease symptoms vary significantly, depending on what condition you have. Skin changes are not always due to skin diseases. For example, you may get a blister from wearing ill-fitting shoes. However, when skin changes show up with no known cause, they may be linked to an underlying condition.Often, a healthcare provider can diagnose a skin disease by visually examining your skin. If looking at your skin doesn’t provide clear answers, Some skin diseases are not preventable. For example, there is no way to change your genetics or prevent an autoimmune disorder. You can take steps to avoid contagious or infectious skin diseases.