If a mole is sometimes itching but itching isn't persistent, this could be a sign of skin cancer? knowing that the mole isn't perfectly symmetrical

Could be : Consult your doctor or dermatologist for any suspicious moles. Educate yourself about the abcd's of melnoma (this applies to other moles & skin lesions as well). See http://www.Melanomafoundation.Org/prevention/abcd.Htm.

Mole: Intermittent itching can be a sign of skin cancer. See a dermatologist to have any suspicious mole examined for skin cancer.

See your derm: Any skin lesion that begins to itch, bleed, or ulcerate should be brought to the attention of your friendly dermatologist.