Is it common to have a skin..

What I mean is it harmful to you?

A skin tag can appear anywhere on your body, and in the vast majority of cases are not harmful. You can leave it there or remove it, at your own discretion. If you don't care, and your significant other doesn't care, then go ahead and leave it. If, for some reason, you want it gone, there are several ways to do so, a couple you can do yourself, but it is strongly suggested you see a doctor to remove it, since it is considered "minor surgery." I will admit, I've removed some on my neck and armpits on my own and had no ill effects, but anyone can be unlucky and have something go wrong when doing it -- hence the recommendation to have a doctor remove it. Note that since they are not harmful, having a doctor remove them is frequently NOT covered by insurance, as it will be considered cosmetic surgery (that's why I removed my own).

FYI -- there are various causes, but generally happen more frequently with age and weight gain (for the record, I'm 30 and have a very athletic build, so age/weight is not always the case, just adds to the possibility).

Wtf is a skin tag?

i dont know what a skin tag is so i am assuming that i never had one so it isnt common

yes there comon and you can get it anywhere on the body. if its a big skin tag, you could go to the doctor and get if off but that always sounded weird to me. i have a couple and if theres ever somewhere i dont want it i just pull it off, or cut it off with clean toenail clippers