A pharmaceutical composition for performing treatment against a skin disease, the pharmaceutical composition comprising at least one decoy and a pharmaceutically acceptable carrier. The at least one decoy may be selected from the group consisting of an NF-κB decoy, a STAT-1 decoy, a GATA-3 decoy, a STAT-6 decoy, an AP-1 decoy and an Ets decoy. The at least one decoy may be an oligonucleotide including at least two decoys bonded to each other, the at least two decoys being selected from the group consisting of an NF-κB decoy, a STAT-1 decoy, a GATA-3 decoy, a STAT-6 decoy, an AP-1 decoy and an Ets decoy. The skin disease may be atopic dermatitis, psoriasis vulgaris, contact dermatitis, keloid, bedsore, ulcerative colitis, or Crohn's disease.