Itchy bumps at the anal opening can be caused by hemorrhoids or a combination of hemorrhoids and perianal eczema. The pimples may appear at the anal opening due to the formation of external hemorrhoids or internal hemorrhoids or enlarged hemorrhoids that have prolapsed out of the anus and become lodged. And because the nucleus of the hemorrhoid stays at the anal opening for a long time, especially if the internal hemorrhoid is embedded, the mucus in the anorectum will ooze out and repeatedly stimulate the perianal skin with itchy symptoms. The itchy symptoms usually last for a short period of time, as long as you do a good job of cleaning, pay attention to your diet and proper anti-inflammatory, the symptoms will improve more significantly. In addition, when perianal eczema appears together with hemorrhoids, the itchiness of the anal opening and perianal skin will be more pronounced and last longer. The perianal skin will be significantly thickened and discolored. It is recommended that antihistamines be used along with hemorrhoid medication to stop the itching and to treat it with tar preparations.