Is my Koi having a scale/skin disease or normal loose scale?

[Yusrin]

Hi.. May i enquire, i noticed this on my Koi recently.. are those scales/skin disease or normal loose scales..? Or its just normal?

So far the said Koi still eats normally, swims normally.. but im just worried if it could affect other fishes if it is a disease. Ive also salt bath the Koi and massage the affected area on its body.. Please help..