Hi, To treat your skin concern Use a Glycolic acid or salicylic acid face wash ( saslic or melawash) Get your blackheads removed regularly Do not squeeze or pick your lesions as it can lead to scarring and pigmentation both Apply clindamycin gel and retino a cream over pimples Apply kojic acid cream( Kojic) over pigmentation marks. Apart from these an appointment with your dermatologist is required for below mentioned treatment options If acne is too severe taking a course of oral antibiotics and isotretinoin might help As you still having acne in your 40s, hormonal pills might be required too Taking sessions of chemical peels would help not only in scarring, pigmentation but also in treating active acne lesions. Hope that answers your query.