Here are the dermal ridges of my babies. Each different, just like them. Check out how the top one is more Yin Yang-ish, and the bottom more like a comma. Cool.
Yes, a dermal ridge is a more medically-correct way to refer to these. The fingerprint would be what is left on a surface after pressing your dermal-ridged finger against it.
I can say that the bottom one is more like my fingerprints than the top one, so I'm a comma-bearing fingerprinter.
I had taken a photo of a fingerprint I left on a metal surface, hoping to see what a fingerprint is made of. It seems to be oils from the skin and skin fragments that make up the telltale print from our fingers.