Wat is soft tissue edama?

Edema=Swelling. 'soft tissue edema' just means swelling of soft tissue ( e.g. Skin/muscle/sub-cutaneous fat). It does not suggest a cause. Common causes include infection (cellulits) , trauma (e.g. Bump or bruise), or allergy (hives) etc..
Swelling. Soft tissue edema is soft tissue swelling. It's more common in your legs than your arms. It can be caused by injury, inflammation, or from heart problems.