Where do birthmarks come from?
In: Biology
There are 2 types of birthmarks: pigmented birthmarks and vascular birthmarks. Pigmented birthmarks are caused by excess skin pigment cells. Vascular birthmarks are caused by increased blood vessels. Birthmarks are a result of a localized imbalance in factors controlling the development and migration of skin cells.
Source: [Wikipedia](https://en.wikipedia.org/wiki/Birthmark)
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