What causes菊花itch?

Anal itching, also known as pruritus ani, has various and complex causes, mainly including the following: 1. **Perianal eczema**: Inflammatory reactions of the anal skin and mucous membranes caused by multiple internal and external factors, leading to itching, and may be accompanied by exudation. 2. **Anorectal diseases**: Conditions such as hemorrhoids, anal fissures, anal sinusitis, anal fistulas, and rectal polyps may irritate the perianal skin, causing itching. 3. **Parasitic infections**: Secretions from intestinal parasites may irritate the anus, resulting in itching. 4. **Tinea cruris (jock itch)**: A fungal infection affecting the superficial skin of the groin, perineum, anus, and buttocks, which can also cause anal itching. 5. **Primary anal itching**: Itching without evident anorectal disease or other related conditions, possibly triggered by diet, environment, anal hygiene, or psychological factors. When anal itching occurs, it is recommended to seek medical attention promptly. After identifying the cause, follow medical advice for treatment to prevent worsening symptoms or the development of other complications.