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Medications: Some medications, such as hormone replacement therapy, chemotherapy and certain antibiotics, can increase sensitivity to sunlight and cause pigmentation as a side effect

Glia 63 , 18401849 (2015)

Studies have shown that a low-choline diet during pregnancy was associated with significant fetal decline of hippocampal DNA methylation of the Cdkn3 (cyclin-dependent kinase inhibitor 3) gene and increased expression of its protein product, kinase-associated phosphatase (Kap), a cell cycle regulator that inhibits cell proliferation [105]

Its not considered painful, and the discomfort lasts just a few seconds