anal fissure

Source: https://www.google.com/url?sa=i&rct=j&q=&esrc=s&source=images&cd=&
ved=0ahUKEwjr74_Eq4HPAhVgHGMKHSdyCqAQjBwIBA&
url=
http%3A%2F%2Fimages.slideplayer.com%2F19%2F5868527%2Fslides%
2Fslide_17.jpg&bvm=bv.131783435,d.cGc&psig=AFQjCNFjY2SJIO-esYDbTH2IHsyzAWWV1Q&ust=1473477924816866

Source: http://www.prorepatin.com/images/grafik_fissur.jpg