Hi,
The pictures are not very clear.
It could be an eczema , lichen planus or a fungal infection.
If sugars are uncontrolled this can get secondarily infected.
Need more details and photos for diagnosis and treatment.
You can consult directly through practo consult and i can help you out.
Next Steps
consult through practo
Health Tips
Avoid scratching.
Make aure sugars are under control.