Acrochordons are a fancy name for skin tags
, which are benign (not cancerous) growths that tend to occur as we age.
They can often be found on the neck, armpits, and groin-- pretty much anywhere where the skin tends to rub. No one knows what causes them, but they are definitely not dangerous. Many things can look like skin tags though, so best to see your dermatologist to check them out.