It is narrated from Sayyiduna Abu Umamah (may Allah be pleased with him) that the Noble Prophet (peace and blessings be upon him) said: The complete manner of visiting a sick person is that one should place his hand on the patient's forehead or hand and then ask about his condition, and the complete greeting is that one should also shake hands.
Hadith Takhrij«اسناده ضعيف جدّا، عبيد الله بن زحر الافريقي و علي بن يزيد الالھاني ضعيفان، أخرجه الترمذي: 2731 ، (انظر مسند أحمد ترقيم الرسالة: 22236 ترقیم بيت الأفكار الدولية: 22591»