Clodius L, Smahel J
Br J Plast Surg. 1979 Oct;32(4):295-9. doi: 10.1016/0007-1226(79)90083-3.
Reconstruction of a beard-bearing area, such as the upper lip, necessitates hair-bearing grafts no thicker than a full thickness skin graft, in order to allow for normal movement. In the normal scalp, however, most of the follicles reach into the subcutaneous fat. By preoperative epilation it seems possible to induce the catagen phase of the hair cycle during which the follicles migrate into the corium and thus will be transplanted as complete morphological units. The clinical results support this concept.