This spot is probably a congenital hairy mole (mole that is present at birth or soon thereafter) and usually has bigger dimensions than the regular moles.
There can be a delay in pigmentation (getting darker than the surrounding area)of this spot (pigmentation may occur from age 1 month to 2 years).
Since the spot is 1 inch by 1 1/2 inches long, it belongs to a group of medium congenital moles (there can be large or giant ones with greater risk for malignancy).
Coarse surface hairs develop in more than 50% of congenital moles and may occur during the first 1-2 years of life.
Congenital moles have greater risk for malignancy transformation later in life than regular moles.
You should consult a dermatologist for true diagnosis!