Based on the context and the answer, generate a question. 

Context: dou was sick for 2 days . the night b4 , she woke up with a low grade fever of about 37.7 degree . so as usual , the daddy pasted a fever patch on her tiny forehead .

Answer:

He is worried about her health , and is doing what he can to help



What caused Dou 's father to apply a fever patch to her forehead ?