I need help with a rash.?

i have a rash on my inner thigh/groin right at the top of my legs (sort of either side of the jewels). i'm a virgin so it can't be an STI, i thought it would just go away but it's been sticking around for a few weeks now. i live in a hostel and someone here had scabies about a month or two ago. i don't really associate with him and it doesn't really sound like it is that. but i'm a little worried and don't know what it is. could anyone help me with this please?