This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Skin
Gradual lightening / blue black colour shift in a tattoo is called: 
Select and explain. 
A. Tyndall effect, B. Halo effect, C. Washing out, D. Leaching
A: Tyndall effect
Answer: A: Tyndall effect 
Explanation: Changes in tattoo maturation Halo effect - extrusion of pigment on deposition near follicle Washing out / leaching/pigment migration-carrying away of pigment by macrophages on deep inseion Ref: Textbook of dermatosurgery & cosmetology, satish S savant, E-2,P-338.