The distal phalanges, as compared with the distal phalanges of the finger, are smaller and are flattened from above downward; each presents a broad base for articulation with the corresponding bone of the second row, and an expanded distal extremity for the support of the nail and end of the toe. Distal phalanx
In the hand, the distal phalanges are flat on their palmar surface, small, and with a roughened, elevated surface of horseshoe form on the palmar surface, supporting the finger pulp.: 6b. 3. The Phalanges of the Hand  The flat, wide expansions found at the tips of the distal phalanges are called apical tufts. They support the fingertip pads and nails. The phalanx of the thumb has a pronounced insertion for the flexor pollicis longus (asymmetric towards the radial side), an ungual fossa, and a pair of unequal ungual spines (the ulnar being more prominent). This asymmetry is necessary to ensure that the thumb pulp is always facing the pulps of the other digits, an osteological configuration which provides the maximum contact surface with held objects.In the foot, the distal phalanges are flat on their dorsal surface. It is largest proximally and tapers to the distal end. The proximal part of the phalanx presents a broad base for articulation with the middle phalanx, and an expanded distal extremity for the support of the nail and end of the toe.: 6b. 3.
See also
Osteopoikilosis
List of cutaneous conditions
Melorheostosis

References
Further reading
Pope, V.; Dupuis, L.; Kannu, P.; Mendoza-Londono, R.; Sajic, D.; So, J.; Yoon, G.; Lara-Corrales, I. (2016). "Buschke-Ollendorff syndrome: a novel case series and systematic review". The British Journal of Dermatology. 174 (4): 723–729. doi:10.1111/bjd.14366. ISSN 1365-2133. PMID 26708699. S2CID 24066368. Helander, Martti Kormano, Ilmari Lindgren; with the collaboration of Inkeri; Lindgren, Ilmari (1999). Radiological findings in skin diseases and related conditions. Stuttgart: Thieme. ISBN 9783131161215. Retrieved 3 February 2018. External links
 Media related to Buschke–Ollendorff syndrome at Wikimedia Commons