i know that the common time for the rash to appear is within two weeks or so.....i've been on it almost a month....the rash is very hard little bumps and is on the soft side of my under arm near my shoulder........i just found it...like when i posted...now, i am imagining that i have a fever and etc.etc. ...i just felt and it is spreading.......down the underside of my arm toward my elbow......