Vitamin K in dermatology.

Systemic vitamins K1 and K2 exhibit multifaceted functions beyond coagulation, particularly in pseudoxanthoma elasticum and similar conditions. Disturbances in the vitamin K pathway contribute to elastic fiber fragmentation and tissue mineralization. Systemic administration of vitamin K, notably via intramuscular injections, has been associated with a spectrum of adverse cutaneous reactions, from erythematous and eczematous plaques to drug-induced anetoderma and sclerodermoid plaques. The synergistic effect of vitamin K2 and vitamin D on bone mineralization has important implications for dermatologists who may counsel patients on supplementation with vitamins with sun-protective behaviors. In its topical form, vitamin K has been investigated for its wound healing properties, particularly in postlaser purpura resolution as well as prevention of cetuximab-induced dermatitis.