Generally, facial thread veins are not dangerous and in some cases they even disappear on their own. However, they can sometimes signify a more severe medical condition such as;
Xeroderma Pigmentosum (XP)
Osler-Weber-Rendu Syndrome / Hereditary Hemorrhagic telangiecastia (HHT)
Sturge-Weber Syndrome (SWS)
In most cases, these conditions will have a variety of other symptoms and you should visit your GP should you believe that none of the common causes we have mentioned have resulted in the appearance of your facial thread veins.
In the vast majority of cases, facial thread veins are not dangerous and patients only seek removal for cosmetic purposes. Thread vein treatment is not actively available on the NHS so you will need to seek private treatment instead.