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Hair shaft abnormalities:
A. Normal hair shaft, B. Vellus hairs in androgenetic alopecia, C. Exclamation mark hairs in alopecia areata, D. Tapered hair in alopecia areata, E. Regrowing pigtail hair in alopecia areata, F. Comma hairs in tinea capitis, G. Zigzag hairs in tinea capitis, H. Trichorrhexis nodosa, I. Trichorhexis invaginata in Netherton’s syndrome, J. Monilethrix, K. Pili torti, L. Pili annulati.
