Adding a birthmark to a kit

Can anyone tell me how to add as birthmark to my kit. I have looked and there is not a topic on how to add a birthmark to a kit. if anybody could help it qould be greatly appreciated.
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I’m sure there are many ways to do this, but if it were me I would use either Lip/Blush/Nail or Q Crimson with a small amount of thinner, and use a paint brush to paint on a splotch the size of what I wanted. Then I’d pounce it off with a sponge. I would add a few layers, baking in between, using different colors, like a different red or purple, to add a little dimension. I would leave some spots a little lighter and some a little darker, and try to best match the colors and splotches a real baby would have. I would also keep a picture, like the ones you posted, in front of me while a painted to give me a really good reference of what the mark should look like. I’m sure there are other ways of doing this, but that is what I would do, and what I have done in the past, to make a mark like this.