How long should a shaved mole excision take to heal on your back?

Three months ago, I had a large, flat (non-cancerous) mole shave excised from my back. The surgeon said that due to its location on my body he couldn't rule out hyperpigmentation. The only aftercare advice I was given was to apply vaseline twice a day to keep it moist. Like I said, it's now been three months and the mole hasn't faded much. The scar is flat, brownish colour, but it is NOT itchy or irritated. I've read that it can take 6-12 months before a shaved mole heals properly. Thanks.

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