Hi.. Welcome to HEALTHCARE MAGIC.. I have gone through your query and can understand your concerns.. As per your complain it seems that you are suffering from post inflammatory hyperpigmentation leading to dark pigmentation. As far as application of Betnovate is concerned that is a steroid based cream containing Betamethasone as active ingredient and initially it can show good results but long term use can have side effects.. So in case if you want to use betnovate you should use it under supervision or proper advise by a trained Dermatologist.. As of now you can use safer depigmentation creams and facewashes..You can wash your face with salicylic acid and glycolic acid containing facewash.. You can start applying creams containing Kojic acid, glycolic acid and arbutin.. You can apply azelic acid creams.. Apply creams containing Vitamin .. Take Vitamin C supplements.. Teatree oil and grapeseed extracts are also helpful. You should exfoliate your skin twice a week to removed dead skin layer.. Limit sun exposure and always apply sunscreen lotion when exposed to sun.. You can also go for treatments like Photofacial, microdermabrasion, chemical peels etc.. Hope this information helps.. Thanks and regards. Dr.Honey Nandwani Arora.