Пот струился по лбу больного. | Sweat streamed down the patient's forehead. |
Бросается в глаза её высокий лоб. | The first thing you notice about her is her high forehead. |
NB When the word лоб functions as a subject and does not have a descriptive modifier, the construction лоб у + Genitive is often preferred to (a) and (b), above: | |
Лоб у Наташи большой и ясный. | Natasha has a high, clear forehead. |