Nutritional deficiency of Vitamin C (Ascorbic acid)
Vitamin C is typically found in fruits and vegetables.
Vitamin C is a cofactor for hydroxylation of proline and lysine amino acids in procollagen molecules, which is required for cross-linking collagen's triple helix.<unk>  therefore leads to unstable collagen and collagen fragility.
Leaking of vascular structures
Gingival bleeding
Petechiae
Easy bruising
Vitamin C is also required for the disulfide bonding in hair leading to corkscrew appearance of hair.
16th-19th century sailors with<unk>  found to have developed tooth decay, bruising, lassitude, and often died from massive hemorrhage
Leaking of vascular structures
Gingival bleeding
Petechiae
Easy bruising
Gingival bleeding
Petechiae
Easy bruising
Eating disorders or select eating habits
Infants who only consume pasteurized milk
Autism
Alcohol disorder
Isolated elderly persons with poor nutrition
Scurvy
Abnormal platelet count and/or coagulation
Rickets
Septicemia
Porphyria
Idiopathic thrombocytopenic purpura 
Bandemia
Hemolytic uremic syndrome