Birthmarks are coloured marks on the skin that are present at birth or soon afterwards. Most are harmless and disappear without treatment, but some may need to be treated.
There are many different types of birthmark.
Port wine stains:
Mongolian blue spots:
The GP may ask you to check the birthmark for changes, or they may refer you to a skin specialist (dermatologist).
Most birthmarks do not need treatment, but some do. This is why it's important to get a birthmark checked if you're worried about it.
A birthmark can be removed on the NHS if it's affecting a person's health. If you want a birthmark removed for cosmetic reasons, you'll have to pay to have it done privately.
Possible treatments for birthmarks include: