We all know what the cause is, each one of us has somehow got soap or other kinds of bathroom stuff or ointment whatever on the scrotum which has caused irritation. however this may not be the case for all of us.
for people such as myself it starts off with itchy then dry then scabby, i tried to pick scabs off but theres too much and it just hurts.
this happened to me because i had to go to an interview so was shaving in the shower and got a bit of the cream in the lower area. trust me i think this foam stuff is worse then soap.
if it doesnt clear on in a couple of days or a week you should go see a doctor because it could be serious and dangerous for your lower area.