My inner thigh is weak and not smoth & my back of penis has white patches(or spots)/ discoloration doctor said it is a stretch mark. And prescribed to use stretch rid on both areas twice daily (1-0-1) Now my private parts are very very dark as compared to my normal skin tone so i asked what should i apply to those dark areas (penis + balls + inner thigh(dark but not as much as penis or balls). For this doctor precribed me melano tx 15gm.(1-0-1). Now my question is should i use both of them together ? How should i use these creams ?