Slightly swollen feet/ankles & achy lower legs...concern?

Just recently my legs, from the knees down, have been extremely achy when I run (cycling has no ill effects). I have also just started noticing that my feet and ankles have been slightly swollen. By ‘slightly’ I mean it’s not all that visually noticeable but my normal footwear seems a little tight and my socks have been ‘cutting’ into my ankles making it very noticeable where they were when I take them off. Life, training, diet, etc has remained consistent before and after noticing this.

My question is should I be concerned about this?? I’m not even sure where/who to start finding out if this is an issue or not…