The most common cause in a study evaluating melanonychia of all morphologies was found to be subungual hemorrhage (29.1%), followed by nail matrix nevus (21.8%), trauma (14.5%), lentigo (11.6%), and race (8.0%).[9] While in a study evaluating only longitudinal melanonychia, racial melanonychia was seen in 68.6%, trauma in 8.5%, fungal in 7.1%, and mixed etiology in 4.5% of cases.[10] Benign melanocytic hyperplasia and nail apparatus malignancy contributed to 5.7% cases each
Chen P-H, Wu J, Ding C-KC, Lin C-C, Pan S, Bossa N, et al
One frequent mistake is injecting too deeply into muscle tissue rather than subcutaneous fat
Hormonal swings create intense food cravings
Additionally, an increased serotonin concentration and reorganization of serotonergic innervation in the cerebellum of Lurcher mice have also been reported [106]