If the anal opening is not wiped clean after a bowel movement, it may be due to more localized dermatomal hemorrhoids, resulting in fecal residue in the dermatomes and difficult wiping symptoms. The first suggestion is that you can choose water to clean the anal area after defecation, which can effectively prevent fecal residue. If the hemorrhoids or mixed hemorrhoids are severe and accumulate in the anal area, you can use medication or surgery to remove the excess hemorrhoids and relieve the symptoms. The actual hemorrhoids or superfluous external hemorrhoids can cause feces and anal canal secretions to remain in the anal area repeatedly, which can lead to unclean stools and even itchy perianal skin due to secretion stimulation, which can lead to perianal eczema and anal pruritus after long-term repeated stimulation.