Welcome to HCM,
As pictures are not available with your query, it is very difficult to get some idea of the problem.
That you developed it after taking medicines can be a coincidence.
Aayurvedic medicine may contain crude salts(bhasm) of metals & can cause such problems.
As you have already consulted many skin specialist and there is no improvement, it will be better to try Homeopathic
You should increase your water intake as much as possible, and can take calcium and vitamin C
tablets twice daily.
Thanks for trusting Healthcaremagic and posting your query.
Hope you found my response to your query informative and helpful.
With good wishes,
Dr.Chandra Shekhar Sharma