斑 - spot, blemish, speck

unevenness (of colour, paint, etc.); irregularity; nonuniformity; blotchiness

buchi salamander (Hynobius naevius)

Nephila clavata (Oriental species of golden orb-weaving spider)

mottled teeth; mottled enamel; fluorosis

cafe-au-lait spot (birthmark)

purpura

(scattered) spots; specks; speckles

long-eared owl (Asio otus); northern long-eared owl

nevus; naevus; birthmark

Great Dark Spot (on Neptune)

remaining in spots

Japanese grosbeak (Eophona personata)