Each differin gel contains Adapalene as active ingredient. Adapalene 0.01% gel is topical retinoid compound. Adapalene is used in the treatment of acne. It helps to stop pimples from forming under the surface of the skin and also help to promote quick healing of the pimples and acne that develop. Use of the adapelene affects the growth of the cells and decrease the swelling and inflammation. Adapalene on applying to the affected area of your skin will help by treating blackheads.