There are many reasons why blisters appear next to the anus, and the common ones can include hemorrhoids, perianal eczema, viral infections and so on.
1. Hemorrhoids: If you suffer from thrombosed external hemorrhoids, due to the venous blood return obstacle around the anus and produce thrombus mass, mostly in the form of blisters, touch the skin with hard knots, may also cause pain around the anus and other symptoms.
2. Perianal eczema: small pimples or blisters may appear on the skin around the anus, which is considered to be caused by endocrine dysfunction, allergic reaction, and moist environment around the anus.
3. Viral infections: especially herpes virus infection, it is easy to cause blisters or breakouts next to the anus, etc. Note that this situation can be contact transmission. There are also HPV-induced warts, which can be seen in the early stages as pimple-like growths around the anus accompanied by moist, itchy and other uncomfortable symptoms.
It is recommended that once found, need to go to the hospital in a timely manner, clear diagnosis under the guidance of the doctor for treatment.