Oily and pimple-prone skin with dark circles is usually due to excess oil, clogged pores, lack of sleep, or stress. Use a light, non-oily night cream that does not block pores and helps control acne, and choose a gentle under-eye cream to reduce dark circles and puffiness. Keep your routine simple by washing your face twice daily and avoiding heavy or oily products. If pimples or dark circles do not improve, a doctor can guide you on suitable products based on your skin type.