Biological tissues contain chromophores that absorb light, as well as fluorophores that absorb and reemit light (fluorescence effect). Light absorption depends on the chromophores’ content and their distribution within the organic matter .
The endogeneous fluorescence of skin is due to the presence of specific fluorophores, i.e. aromatic amino acids such as tryptophan and tyrosine, collagen and elastin, porphyrins and flavins . Some physiological
and pathological processes such as aging, photoaging , psoriasis  and skin cancers  have shown characteristic changes in skin fluorescence .
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