Thanks for posting your query at DoctorSpring.com
I can understand your concern.
The picture you have posted is of an atypical mole. This would need an investigation from your dermatologist.
The dermatologist would examine it under a dermatoscope and if then required would do a biopsy from the lesion to check whether it's a melanoma or not.
I would like to give you some information regarding moles.
A new or changing mole or blemish is the most common warning sign for melanoma. Variation in color and/or an increase in diameter, height, or asymmetry of borders of a pigmented lesion are noted.
Symptoms such as bleeding, itching, ulceration, and pain in a pigmented lesion also warrant an evaluation.
ABCDE criteria for a changing mole, which are as follows:
Asymmetry: Half the lesion does not match the other half.
Border irregularity: The edges are ragged, notched, or blurred.
Color variegation: Pigmentation is not uniform and may display shades of tan, brown, or black; white, reddish, or blue discoloration is of particular concern.
Diameter: A diameter greater than 6 mm is characteristic, although some melanomas may have smaller diameters; any growth in a nevus warrants an evaluation.
Evolving: Changes in the lesion over time are characteristic.
Lesions exhibiting these features should be considered potential melanoma.
In your case i could see a colour variation and hence i advised it to be investigated further.
Please let me know if you have any queries.