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I am an experienced Board Certified Dermatologist and I would be happy to help. Is it possible to forwarda photograph
This is difficult to tell. I would recommend consulting a dermatologist. It very well may be a totally benign lesion called a Seborrheic Keratosis but if not it has features suspicious for a melanoma such as two colors, asymmetry and an irregular border. We dermatologists utilize an special light called a dermatoscope and using this we can quite easily tell the difference between a totally benign lesion such as a Seborrheic Keratosis and a suspicious lesion.
Good question. The ABCDE advice is meant as a general guideline. A Seborrheic Keratosis can have all the letters including greater than 6 mm. Some family physicians are also learning to use Dermatoscopy. But if do not, they certainly can perform a shave biopsy which is easy, quick and nearly pain free.
A week would not really matter but I would not wait beyond that. Please let me know what happens and feel free to ask for further advice.