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The treatment is very effective in children.If the lesion is spreading one needs oral steroids
for few months .Along with this one can apply tacrolimus cream or pimecrolimus
cream locally. These are very effective creams in children and very safe too.If the lesion is small, photo-therapy might not be necessary ,though it is a good option in vitiligo
.Narrow band UVB(NB-UVB) photo-therapy would be preferred in children. And plz don't get scared of oral steroid in children ,if given properly it is very safe.So,kindly consult a dermatologist
who can advice you safe medicine.