I do not feel this is a cause for worry as such.
There are no worrisome signs in this.
As you know, you have to observe for signs in a mole which are defined by the acronym ABCDE.
A is for Asymmetry: One half of a mole or birthmark does not match the other - yours is symmetrical.
B is for Border: The edges are irregular, ragged, notched, or blurred - your borders are smooth. ALthough they are ill defined this is not a criteria
C is for Color: The color is not the same all over and may include different shades of brown or black, or sometimes with patches of pink, red, white, or blue - cplor is uniform in this mole.
D is for Diameter: The spot is larger than 6 millimeters across (about ¼ inch – the size of a pencil eraser), although melanomas can sometimes be smaller than this - it is less than 6 mm.
E is for Evolving: The mole is changing in size, shape, or color - it is not changing as far as we know. Although there was the initial development of the mole from the freckle, since then it has not been changing as per your observation.
Hence I do not think you need to worry about this.
You can wait safely for your derma appointment.
Hope I have been able to clarify the situation for you and helped in resolving your query.
If you need more help, please let me know so l can continue to assist you.
Thank you and I wish you the best of health - stay safe!
Dr. P. Jyoti