I have a small lump in my inner arm where my elbow is sometimes gets bigger and its on my vain . im really worried if its blood stock and got hard ?

Lymph node: This describes the location of the epitroclear lymph node in its normal position. These are small structures that sift through body serum to remove debris. They enlarge when there is a stimulus, often a bug bite or rash nearby or anywhere on that arm. they usually enlarge & then shrink over a 3-4 wk cycle. It's not blood stuck there.