Hi, many thanks for the query!
Yes, your symptoms suggest that you have infection in the wrist swelling.
Just show it to your doctor once, if its an abscess
, it needs to be drained.
You may do FNAC (Fine Needle Aspiration Cytology) of the swelling to confirm the diagnosis, but from your description it may not be needed, if confirmed by your doctor clinically.
Take appropriate antibiotics & anti-inflammatory drugs as per your doctor's opinion. Continue your treatment for cystitis
Wish you a good health.