On my penis , I have brown lines which have slowly formed throughout the years. They have small indentations, or lines, and form around the base of the penis (not the tip but the skin behind it. Like i--l, l being the brown lines.) I have not checked those clinically. There is also this other thing that is sort of U (flipped, and it occurs inside the U) shaped area, similar in locations with the previously mentioned brown lines, and looks rather similar yet it is not brown and is a bit more submerged in general (relative to the rest of the skin), as opposed to the brown lines which are more emerged . I have checked this clinically, and they say it is a mosquito bite but I am not sure that is the case since I have reason to not trust him since he has misdiagnosed me once already.