I applied clindamycin n nicotinamide gel yester night as I would most of the times and in the morn my face was red swollen itchy n it hurts please help?

Allergic reaction. Stop taking this gel and do not resume. You are having an acute allergic reaction. If it gets worse see a doctor asap. Treatment may include corticosteroids ( topically, or orally or intravenously); antihistamines; anti-pruritics; Epinephrine for severe respiratory/cardio-vascular reactions;topical lotions or ointments: baths with additives.