Source: Tafsir al-Ahlam al-Kabir (Ibn Sirin)
Itching in a dream indicates investigating the affairs of relatives. Whoever sees himself scratching his body will gain wealth from his relatives.
Source: Ta'tir al-Anam fi Ta'bir al-Manam (Al-Nabulsi)
Itching indicates poverty and need. It may also indicate compassion for relatives.
Source: Al-Isharat fi Ilm al-Ibarat (Ibn Shahin)
Itching is interpreted as wealth. Whoever sees himself scratching his head is asking about the state of his superior.