How are you? Itching in the groin region can be due to excess sweating (hyperhydrosis), fungal infections, acanthosis nigricans, dandruff, hydradenitis supparativa, heat rash etc.
In all the above mentioned causes, hyperhydrosis and fungal infections are more common. Have you ever used antifungal treatments? Tinea cruris or jock itch is the common fungal infection that affects the skin of your inner thighs, buttocks and genitals. It causes an itchy red, ring shaped rash in these areas. Skin scrapings will help determine the fungus.
Hyperhydrosis can occur due to many conditions like food, climate, beverages, menopause, low level of male hormones, low blood sugars, tuberculosis, certain drugs, heredity, stress and anxiety.
Consult a dermatologist, for complete evaluation and treatment accordingly.
All the best.
not gonna be able to get a straight answer from most doctors, seems ALOT have this problem and never get proper treatment and most dr's blow it off as something else. but there are some dr's out there that know exactly what it is and will treat it if you talk to them properly and pay a heavy fee.