Thanks for writing in.
There is nothing to be worried about.
You can have tinea corporis
You can apply calamine lotion over the affected area.It is a soothing lotion.will help to reduce itching and bruising.
Also you can take tablet Zyrtec for itching.
These will help a lot.
I encourage you to visit a qualified dermatologist
for proper diagnosis ant treatment.
Hope this helps.