How do i know if a weird dark skin spot is cancer?

Skin Biopsy: Please make an appointment to see a primary care doctor or dermatologist. If they agree with your "weird" assessment, they can do a simple biopsy that day and have an answer within a few days. "when in doubt, check it out.". Good luck!

Skin cancer : Most skin cancers are the result of excessive sun exposure/tanning. Genetics play a strong role too. Any skin lesion that is changing size, color, shape or an area that does not heal is suspicious for skin cancer and should be evaluated by a dermatologist.