Hello,
Thanks for posting your query at DoctorSpring.com
I can understand your concern.
From the pictures, it seems to be a condition called pityriasis rosea. It's a viral infection and causes skin lesions which follows its own course of 6 to 8 weeks and then resolves on its own.
Usually no treatment is required as it resolves its own.
In case you get itching, you can apply calamine lotion to soothe it.
Please let me know if you have any queries.
Regards.