What’s the label that you used for this whole customisation, the code I’ve put up is just an example 
So for this, just replace customising_1 with the label name you’ve used instead, and ignore the hair choice I’ve put in since I assume it’s already in your coding
label customising_1
choice
“Skin Tone.”{
NARRATOR
Customising skin tones are not possible.
goto customising_1
}