Skin tags are composed of an overgrowth of normal epithelial cells, which enclose a dermal connective tissue stalk made up of loose, edematous collagen fibres, blood cells and sometimes fat cells.
A recent review highlighted the emerging role of pharmacogenetic screening for the prevention of severe cutaneous adverse drug reactions (ADRs) such as Stevens-Johnson syndrome (SJS), toxic epidermal necrolysis (TEN) and hypersensitivity syndrome reaction (HSR).