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  • Fibroblasts - Skin cells that produce collagen.
  • Fine Needle Aspiration (FNA) - See Needle Aspiration
  • Fotemustine - A chemotherapy agent sometimes used to treat metastatic melanoma. It belongs to a class of chemotherapeutic agents called nitrosoureas.
  • Fraction - A daily dose of radiation; 1 part of a total prescribed dose of radiation.
  • Fractionated - Divided into fractions, or several daily doses of radiation.
  • Freckles - Small, tan flat spots that appear on sun-exposed surfaces of the skin; they are caused by exposure to the sun's ultraviolet radiation.