I understand that you want to do snowboarding, but if you don’t take care now, the injury might flare up.
Rest is required at least for 1-2 weeks with proper cryotherapy, compression bandage to take care of swelling and passive exercise around ankle joint.
Your symptoms suggest that you might have Achilles Tendinitis.
It is a common overuse injury.
You should be taking general prevention like avoid excessive running uphill and avoid training errors, such as overly rapid increase in running mileage.
I think consultation with an Orthopaedician is must and get imaging study done.
Standing foot radiographs in AP, lateral, oblique views can be taken.
Keep me informed what doctor has to say about this.
My tendons up the back of my heels are very red and the whole bottom of my feet are so red and scaley. My tendon area hurts so bad I can't hardly walk . does anyone have an answer?