Raised mole on shoulder. Pinched it n piece of black skin broke off. Scratched with nail it bled and now the mole is flat. Nodular melanoma? 20yo guy

See your derm. While melanoma in a 21 year old is rare, it does occasionally happen. I would bring this skin lesion to the attention of your friendly dermatologist. If the lesion appears suspicious to them they would perform a skin biopsy to obtain a diagnosis. And remember to limit your exposure to UV radiation. Wear sunscreen with an SPF of at least 30 and try to cover up as much as possible.
Need for examination. It is not feasible to provide a meaningful opinion without examining the lesion. It may need to be removed and examined by a pathologist. Please see your doctor.

Related Questions

Had the same 3 mm slightly raised medium brown mole on inner thigh for 2 years. It hasn't changed. Would nodular melanoma have grown bigger by now?

Yes. Sounds like a benign mole to me. A 3mm pigmented spot that hasn't changed in two years is very unlikely to be melanoma. Read more...
Mole . I agree wi dr. Klein on this. A pigmented mole that doesn't change size or color in 2 years is benign. You can always have a dermatologist remove it for cosmetic reasons - but don't stress about it. Remember the abcds of melanoma - assymmetry, border, color, and diameter. If it didn't become irregular in shape, develop a "spreading" border, change colors, or grow, it's not melanoma. Read more...
ABCD's. Remember your abcd's when thinking of melanoma. Look for moles with asymmetry boarders that are irregular color differences within the same mole diameter greater than 6mm also any new mole or old that starts to itch, bleed or ulcerate should be of concern. Another rule is the ugly duckling rule. Which refers to a mole that looks distantly different from the others on your body. Read more...