Hello, i would strongly recommend you not use Candid B cream for the dark pigmentation on your mother s cheek. Candid B cream is an anti-fungal cream with steroid. This cream is used only in specific dermatological conditions as prescribed a qualified physician.There are a variety of skin disorders causing dark pigmentation. The most commonest cause of dark pigmentation on cheeks in an elderly lady is a condition called Melasma.The cause of melasma is complex. There is a genetic predisposition to melasma, with at least one-third of patients reporting other family members to be affected. In most people melasma is a chronic disorder. Sun exposure, pregnancy, hormonal changes, photo-toxic reaction to Scented or deodorant soaps, toiletries and cosmetics or medications are the commonest triggering factors of Melasma. There are different modalities of treatment for Melasma and i would recommend you to consult a qualified Dermatologist for an expert opinion regarding your mother s skin condition and treatment.