I notice black spot in heel 3 weeks ago?

Could be. Many things from a wart to skin cancer. Get it checked specialy if its changed shape, raised or color. Don't mean to alarm you but better safe than sorry.
ABC's. Although i agree with all the posts previous, use the abc's (for melanoma) to help relieve some stress before you see a doctor is the spot asymmetrical? Are borders irregular shaped? Is the color uniform or multicolor? What is the diameter? Also is it elevated? Lastly, of course get it check-ed out but those abc's should help relief some stress. Hope this helps!

Related Questions

I noticed a black spot in my right heel, 3 weeks ago, so I want to ask about it, what it could be?

ABC's. Although i agree with all the posts previous, use the abc (for melanoma) to help relieve some stress before you see a doctor is the spot asymmetrical? Are borders irregular shaped? Is the color uniform or multicolor? What is the diameter? Also is it elevated? Lastly, of course get it check-ed out but those abc';s should help relief some stress. Hope this helps! Read more...
It could be nothing. Or it could be skin cancer. I would recommend a visit to a foot doctor or dermatologist for them to take a look. A biopsy may be recommended. Read more...