Scabs and debris around the eyelashes are often a sign of demodex infestation. Crusts / dandruff are not always cylindrical in appearance. Demodeces are found under all scabs, therefore, I give the eyelids a good scrub before looking. The trick is to pull gently on the lashes and turn. Demodeces are seen as bright, tiny cylindrical objects in the highest power (x16 lens with the Haag Streit slit lamp). No need for hair removal.
Video credits to Yong Ming Por YouTube channel