Your wife most probably developed melasma
. To treat the condition she might start with kojivit cream in morning and melalite xl cream in night. However, these creams should be applied with utmost precaution as too much rubbing or using these in excessive amount may lead to redness
and skin irritation. So a very small amount needs to be applied. Also she should take oral antioxidants and vitamin c
supplements. Sun exposure should be avoided and a sunscreen should be applied. Ask her to follow the treatment for three weeks, once the pigmentation has lightened milder creams can be prescribed for maintenance. Similarly if there is not much response after 3 to 4 weeks, course of treatment might be changed. In that case few sessions of chemical peels
or LASERs can be tried. Take care.