I noticed more blackheads since I started using hydroquinone and retinoic acid . Is this normal? I m also using other medicines like erythromycin , benzoyl peroxide, miconazole , and adapalene . another thing i m curious about. after I apply hydroquinone and retinoic acid, will the other creams like erythromycin, benzoyl peroxide and miconazole be absorbed in my skin? :) Thank you! :))