Can you identify this unusual birthmark on my head?

The doctor that delivered me said he had never seen anything like it. It is on my head and it has no hair, it is also wrinkly, lumpy, dry, hard and sometimes itches.

It is almost like a growth on top of my skin, it isn't flat. I am 18 years old and know nothing about my birthmark, please help me find out.

Can you identify this unusual birthmark on my head?
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