Bruise / Knot on My Calf

After a calf session I got a knot on the soleus muscle in the calf right where it meets the gastrocnemius. It doesn’t hurt when I work my calf but theres a little pain if I put pressure on it. In the morning its swollen and a little red then throughout the day after walking and stairs it looks better but is still tender.
Anyone got an idea what this is to maybe save me a trip to the doctor?