In the article, “Three-week topical treatment with placenta-derived mesenchymal stem cells hydrogel in a patient with diabetic foot ulcer: A case report”,[ which appeared in Volume 96, Issue 51 of Medicine, “PDMSCs hydrogel (cell number: 1 × 10^6/cells/cm2)” should be written as “PDMSCs hydrogel (cell number: 1 × 10^6/cells/ml).”