Prolonged treatment (usually several months to years) with more than 4% hydroquinone
can cause a condition calles 'Ochronosis', a permanent skin discoloration. Apart from this, there are no hints of skin darkening on using this cream. You have other alternative medications that are available to treat the condition. Consult your dermatologist
for a better option if you are not satisfied with this one. You should also inform the doctor if you are breastfeeding
. Take care.