I have a mole that is scratchy since some time. should i worry?

Maybe: Reasons to have a skin blemish checked out include, bleeding, change in size, change in color, healing then recurring (sometimes mistaken for itching), multiple colors in the mole. When in doubt, check it out. Simple in office punch biopsy can clear up all questions.

Potentially: When evaluating a mole for potential cancer transformation the history of its behavior is an important component. Questions to ask are: is it a new mole or pre-existing, is it getting bigger, has the color changed, does it itch, has it bled? For an in depth self mole evaluation refer to the "abcdes" in the aad website. Bottom line, see your dermatologist.