Anytime my sister finish taking her bath her body will start scratching her . Pls What could be the cause?

Anytime my sister finish taking her bath her body will start scratching her . Pls What could be the cause ?

I had same problem years ago,in extents that each time I want to take ma Barth I began to think,the feeling is so bad,but I stopped it with a provoking command tune,but by God’s healing power.

Take bath without soap for some days

i think may be this is an symptom

May be is allergy to either cold water or hot water

it could b polycythemia