What causes tinea cruris?

Tinea corporis/groin (ringworm) is a skin disease mainly caused by fungal infections. Common pathogenic fungi include Trichophyton rubrum and Trichophyton mentagrophytes. The causes of this condition include: 1. **Fungal infection**: This is the primary cause of tinea corporis/groin. It can be transmitted through direct contact with infected individuals, animals (such as cats and dogs) suffering from fungal infections, or indirectly through contact with contaminated clothing or objects. 2. **Warm, humid environments**: Warm and moist conditions favor fungal growth and reproduction, increasing the risk of infection. 3. **Poor personal hygiene**: For example, not changing underwear frequently or not cleaning the body promptly creates conditions favorable for fungal survival and proliferation. 4. **Weakened immune system**: A decline in immunity weakens resistance to fungal infections, thereby increasing the risk of infection. 5. **Other factors**: Such as long-term wear of tight clothing, diabetes, and chronic debilitating diseases, which may also increase the risk of developing tinea corporis/groin.