My 7-year-old daughter experiences mild itching on her back for about 5 minutes after taking a bath. However, she does not feel itchy throughout the rest of the day. During her bath, she occasionally uses soap or applies mustard or coconut oil to her body. After the bath, she applies body lotion. Despite these practices, the itching occurs consistently post-bath. Could you please advise on the possible causes and suggest any remedies?