What Treatment Can Help With Browning Lines On My Right Hand Fingers, When Propysalic NF Ointment Is No Longer Effective?

Kindly suggest treatment for browning of lines on my right hand fingers. I presume they are the results of chopping pomegranate every night. Sometime back a dermatologist recognised as housewife s excema, and prescribed propysalic NF Ointment. The discoloration disappeared after a week of using propysalic NF. But now he ae been using it since last 1 week without any result. Kindly advise at the earliest. Thanks