Hello,
Thanks for posting your query at DoctorSpring.com
I can understand your concern.
This seems to be lichen planus. It's a chronic condition which affects the skin and mucous membranes with characteristic violaceous papules.
It would be best to treat it at the earliest or it could progress.
The best treatment for this would be application of Triamcinolone acetonide cream twice daily on the affected area. You will need a prescription for the same. You need to follow up with your dermatologist to monitor the condition.
Please let me know if you have any queries.
Take care,
Regards.