Question about a mole. If it easily gets puffy and reddened, is it a bad sign?

Yes and no. I have always said to patients that any mole that changes character and the DX is not clear cut is better in a jar than on your body. A lot of these moles never cause problems but the danger of a changing mole is considered dangerous. Your family doc is best to decide! Never take these changing moles for granted without having checked!