Are birthmarks serious?Most birthmarks are harmless. However, it's wise to have your doctor check moles, especially large ones known as giant pigmented naevi, which are more likely than small moles to become cancerous over time. Your doctor will also want to keep a check on potentially problematic marks, such as port-wine stains which are near the eye, large haemangiomas on an arm,
leg or near the eye, or large groups of brown marks. Any birthmarks (other than Mongolian spots) which are located on the lower spine may also need special attention.
Some birthmarks may need treatment because of their location. Obvious birthmarks, especially those on the face and neck can make people unhappy with their appearance, especially if they have experienced teasing and staring. This can affect their confidence and self esteem. For example, a raised birthmark near a child's eye may interfere with his or her ability to see. In rare cases, birthmarks are associated with other conditions, such as growths on the liver, lungs, stomach, or intestines.
Port-wine stains on the face or neck, even small ones, may bother a child tremendously and may even be psychologically damaging. In that case, specialised make-up can be used to disguise the area. Cavernous haemangioma can become dangerous as they go deeper and can cause complications. For example, if one's near an airway, it could cause breathing difficulties.