General: a benign tumor covered in epithelium with a dermal stalk 


Risk factors: middle-aged


Physical exam: tan or flesh-colored, small, pedunculated papule with a smooth surface, often in regions such as the axilla, groin, neck, eyelids, can have necrotic, crusty appearance if irritated 


Differential: nevi, neurofibromas (can be pressed in), carcinomas 


Histology: thickened epidermis with dermal connective tissue as a stalk, hyperkeratosis, papillomatosis, acanthosis, only need to send necrotic or large tags to lab  


Complications: cosmetic appearance, irritation, # can increase with age


Treatment: none necessary unless troublesome for patient, then (1) snip off with scissors or (2) cryotherapy


***Do not attempt to cut off a skin tag with scissors at home on your own! This can be dangerous and lead to bleeding and infection. Please see a dermatologist who can remove the tag safely!***


References: AAD Basic Dermatology Curriculum, Dermatology by Bolognia et. al., Lookingbill and Mark's Principles of Dermatology, First Aid USMLE Step 1 2020, First Aid USMLE Step 2 CK