Do minor anal fissures require surgery or medical attention?

Medical tx may help. Many anal fissures can be treated with conservative therapy - drink plenty of water, eat a high fiber diet, take a fiber supplement, use topical agents like witch-hazel, anusol.... Surgery is reserved for failed medical therapy.
If minor, ... anal fissures are treated medically. Stool softeners are used to help have easier bowel movements. Hemorrhoidal creams or ointments are helpful for wound healing and soothing. Simple pain medications, such as ibuprofen or acetaminophen may be helpful.