If you have an impaired immune system (e.g., from having diabetes, HIV/AIDS, or atopic dermatitis – a chronic, genetic skin condition characterized by itchy, inflamed skin and associated with asthma and seasonal allergies), you may be more likely to get jock itch. This happens because the skin barriers that normally protect you from viral, bacterial and fungal infections become compromised. Use extra care to prevent and treat jock itch, and watch out for any potential complications when you get jock itch. You should also see your doctor and ask about a daily anti-fungal oral medication as a preventative measure if you are at risk.. Jock itch, also known as tinea cruris or ringworm, is a fungal skin infection that affects the entire crotch zone. Jock itch manifests as an itchy, clearly defined, reddish rash. Jock itch manifests as an itchy, clearly defined, reddish rash.. Jock itch is the common name for tinea cruris, a fungal infection of the skin of the inner thighs, buttocks and genitals, according to MayoClinic.com. This infection is most likely to occur in people who have moisture on the thighs, such as that caused by sweating..