Side effect from TRT… swollen ankles…?

I’ll keep it short and sweet. Been on TRT for 2.5 months. 0.8mL/week. No complaints at all. Very happy, great gains and improvements in other areas. Only side affect I’m experiencing is swollen ankles? Is this from maybe putting on more muscle mass in a relatively short time span, or extra water weight? Just curious as to if anyone else has ever experienced it. Thanks in advance!