Grains under skin

For years i've had many countless "grains" underneath my skin on the lower arm. At concentrated parts they resemble cellulite, and seem to increase as i age (i am 22). They rather resemble fordyce spots but on the lower arm. Almost unnoticeable unless pressed on, and they do not itch/ bleed etc. Sometimes they seem to darken under my skin. I do not think it's Keratosis Pilaris.

Please help me identify this symptom!