I'm having outside calf pain, what can I do?

Strain/partial tear. Calf swelling and pain can often be due to local trauma- either a significant strain or actual partial muscle tear. This allows for local bleeding or hematoma formation within the injured muscle. Partial tears of the gastrocnemius (medial/inside head) are common injuries that may take weeks to resolve with rest, ice, elevation and ace wrap compression as the standard treatment.