What is the cause of itching in the groin area?

Patient's question:

Sometimes I feel itchy in the groin area, with a discharge like cottage cheese, but after a few days, the cottage cheese-like discharge disappears, and there's still some itching. Eventually, it gets better on its own. What could be the reason for this? // Thank you
First follow-up question: Is this condition serious? What causes it? Can it be treated on its own? / What should be noted?

Doctor's answer:

Vaginal itching often occurs inside the vagina, on the outer side of the labia majora, the mons pubis, the clitoris, and the labia minora. It can cause a sensation of itching in the perineum and may spread to the area near the anus. It is a type of localized pruritus. It is often extremely itchy and tends to be worse at night. Vaginal itching is a symptom caused by various disorders of the external genitalia and is one of the more common and distressing symptoms in gynecological diseases.
Causes:
1. Local factors
① Special infections: Candidal vaginitis and trichomoniasis are the most common inflammatory conditions. Use a weak saline solution for washing daily. Rinse the saline with freshly boiled water, then let it cool naturally before washing. Wash your hands thoroughly before washing, and disinfect your underwear. Change your underwear every day. Persistence for a period of time will improve the condition.