What Causes Itchy Red Spots All Over The Body?

Hi! I had a laparoscopy with cist and endometriosis 3rd level removed 4 weeks ago and injection with prostap 3 after 3 days after the surgery. ! week ago I had my period and I noticed red spots starting to appear all aver my body. Now my body is full of these red spots, they are a bit icthy. What an I do? thanks!! Laura