Hi Sam ,
Thanks for writing in.
It can be purpuric spots due to thinning of skin.Prednisolone
on long term use can cause thinning of skin and bruises.
You can apply calamine lotion over the area.Also analgesic like paracetamol
would be helpful.
Take a lot of lemon juice daily.Also you can take vitamin C tablets daily.
Vitamin C ,calcium,vitamin K supplements can protect against bruises.
I encourage you to visit a qualified dermatologist
for proper diagnosis and treatment.
Consider steroid free medications for atopic dermatitis
Hope this helps.