Psoriasis or jock itch?

i was diagnosed with Psoriasis in my groin area last year without any skin tests. previously, i had a test done on a fingernail which the doctor said was "maybe psoriasis, maybe an infection" to my disappointment. if my derma based his visual diagnosis of Psoriasis in my groin soley on my possible fingernail psoriasis, is it likely that he may have confused Psoriasis in my groin with a common case of jock itch or some other infection? Tweet