Hi there ..
It appears your problem is long standing given the pigmentation noted and the lichenification.
Detailed history on Medical, Psychological, personal, family history etc is required and some blood tests may also be needed to complete an evaluation and only then can the appropriate treatment be prescribed.
Best to connect directly online using this App's INSTANT ONLINE Consultation 🙏
Health Tips
Avoid OTC products, home remedies, self medications and Dr Google's suggestions 🙏