Questions
1) since how long has problem this been?
1) has the person in question has been immobile/bedridden for long?
2)did this person have any surgeries in the recent past?
3)does this person smoke or drink, if yes since how long and how much?
4) Does this person has loss of hair on the affected leg.
5) does the person has shiny skin on the affected leg?
Next Steps
the above questions are important to say anything further and only pain in the calf can just be due to exercise/some unaccustomed work or due to some trival trauma.
Health Tips
best is to consult a doctor in-person. actually a surgeon to be precise.