Constant itching all over bidy.

I have been non stop itching all over my body for almost two months now, my friends had it also a little while back but we believe that was because she was pregnant and it's a side effect however she had a termination, I am not pregnant so it isn't that and I'm pretty sure it's not something I could have caught from her, I haven't changed anything in my diet or anything as far as I know and I'm not allergic to anything either as far as I know, how ever I have been itching mainly behind my knees, bottom of stomach/hips, tops of my thighs and in the middles of my arms and once I itch little white lumps pop up and then go red and sometimes start bleeding and then continue to just itch, I have 0 clue why or how it has happened and it's almost been two months, it's keeping me up all night and it's so annoying