800px-mee27s_lines

Leukonychia striata
Mee’s lines due to chemotherapy. Patient had received 4 triweekly infusions of AC (cyclophosphamide, doxorubicin). Lines were not ridged, and migrated outward with nail growth.
By Londonsista – Own work, Public Domain, https://commons.wikimedia.org/w/index.php?curid=12887962