Thanks for posting your query. I can understand your concern. I reviewed the picture.
It seems to be lichen planus which is like an eczema. Its violaceous in colour. Its not infectious.
The treatment for it would be application of cortisone cream mixed with Mupirocin cream twice a day for two weeks.
In case it doesn't start improving in a week, it will be best to see your doctor who can examine it thoroughly.
Please let me know if you have any queries. Take care
Patient replied :
thank you, but I am sure that is not Eczema
Because I do not have Eczema symptoms
Please try the treatment as mentioned for a week and get back to me.
It should resolve on application of the ointments I mentioned.