21 mo old has a small bump on back of head, close to bottom of hair line, under skin. Feels like a swollen blood vessel, soft, but doesn't seem to bother her when we gently touch it. No discoloration. We just noticed it when my hand brushed over it.

Likely lymph node. There are thousands of lymph node located around the body that help screen out germs in the body serum. There are many in the neck, head & behind the ear. At rest these are often 1/4 inch in diameter (pea sized) and may grow to marble sized when reacting to a stimulus. Bug bites, or viral infections can increase their size.What you describe is normal.If concerned review this with the kids doc.
Moniter. Likely cyst will not worry If it keeps enlarging in size ,needs to see physician .

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