Scabies Burrow:

img.webmd.com
Don’t focus on the redness or wrinkles here below. Note burrows at base of thumb, & between 3rd & 4th fingers

reference.medscape.com
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Scabies looks like any rash with excoriations:

hardinmd.lib.uiowa.edu

hardinmd.lib.uiowa.edu
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Scabies Under the Microscope
.