After a radical prostatectomy you may have
scrotalGenital injury
Scrotal mass
Scrotal masses
Scrotal swelling
Testicle ultrasound swelling and some discomfort that persists for a while. Three weeks after a radical prostatectomy is not that far along. Discuss this with the urologist who did your surgery and see what his/her experience has been in this regard.
The red surface irritation is probably just that, local irritation. If it persists, ask your urologist to look at this.
S.A.Liroff, M.D.