I notice a bump on the mole on my chin. Is this melanoma?

Hi doctor,

I am a 28-year-old female. I have always had a small, raised, symmetrical mole on the right side of my chin. It has always been very benign and had a hair growing out of it that I consistently plucked. About two weeks ago, I noticed a small, shiny whiteish bump on the mole and called my dermatologist. Because of the holidays, I could not get an appointment anytime soon and still have another week to wait. Over the last couple of days, the mole has gotten bigger though it has stayed symmetrical and is still slightly smaller than a pencil eraser. It is slightly more raised and it stings to touch. I also realized that it has been a month or two since I had to pluck any hair. None has grown.

I have had a mole a couple of times but this does not really look like the previous moles. I am conscious it could be another more severe zit or maybe a cyst but I am very nervous that it is cancer. I had a couple of moles removed in childhood that were not quite suspicious but that the dermatologist removed just to be safe. My mother has had several basal cell cancers removed. I spent many summers in my youth outside and am worried that this is melanoma or nodular melanoma even though it is not dark.

Please help.