20yo guy.dark brown eyes.a small black spot in on iris.last eye checkup was 5-6 mnths ago. seems slightly raised.vision=ok.pupil=ok concerns:melanoma?

"OK" to be concerned: Iris nevi should be periodically assessed for growth as should any pigmented skin lesions. At your age melanoma iris risk is low. If pigment spot is significant i would recommend careful anterior segment photography to allow comparison over time. Iris melanoma's when they do occur are usually of the lowest grade of malignancy ; thus have a favorable prognosis if surgery is ever indicated.

Highly unlikely: Don't panic and let your opthamologist tell what they think it is.