It is possible that the high levels of estrogen that occur during pregnancy can make tags grow faster and more in number. This is the same reason that some moles and blood vessel growths get larger during pregnancy. Weight gain is another factor that is often associated with developing skin tags.
There are only a few things that a person can do to reduce the development of skin tags. The main factor is to reduce friction where the tags tend to develop. Necklaces are the common provoking factor in skin tags growing more on the neck. Friction under the arms can also promote growth of tags in that area. Friction-reducing powders or powder deodorants may help reduce the irritation that can make tags grow faster under the arms.
Dermatologists are asked by patients to remove skin tags on a daily basis. Tags are easy to remove but the removal is not always covered by health insurance, unless the areas are significantly irritated and causing pain, bleeding or swelling.
If you have the manual dexterity to tie a thread around a tag, it will strangle off the blood supply and make a skin tag fall off in most cases. This process might hurt a little.