These include light-colored patches called ash-leaf spots,
acne-type growths on the face, nail beds, and the body, and
shagreen patches.
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There is no typical name for "shark Skin" however there is small
denticles on some shark species that are tooth like that protect
the sharks actual skin. its like the sharks "armor" if you
will.
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Yes, it is not recommened that you touch any type of aggressive Shark, but if you do, the Shark may become violent from any type of petting.
Additional information: Shark skin, also called Shagreen, is toothed and very rough if rubbed against the direction in which the 'teeth' point. In the past it was used as an early form of and paper and it can easily cause abbrasions to human skin.