How is a birthmark diagnosed?

In a mole-screening is not only a certain birthmark, but the whole body investigated. In addition to the clinical examination should also moles with a Illumination microscope reviewed. This investigation is not painful; the moles are small with a microscope and can be better assessed. 
Some doctors also have a Illumination microscope attached to a computer is connected. This allows images of moles save. At the next check changes can be due to better detection.