This study looks at how **fetal cells**, which are cells from a baby, behave after a mother gives birth. The main focus is on **chemokine receptors**, which are special parts of cells that help them move around the body. The researchers want to understand how these receptors work in women who have wounds after giving birth. To do this, they will take blood samples from healthy women and women with wounds after childbirth and study the cells using **RNA sequencing**, a method to understand the genetic activity in cells.

**Key Points:**

• Participants must be adult women who have been pregnant and agree to provide blood or saliva samples.
• The study compares women with skin ulcers to healthy women without skin ulcers.
• Participants must not be minors, under legal protection, or have a compromised immune system.

This research aims to find new ways to help wounds heal by using the natural **stem cells** from fetal cells that remain in a mother's body after pregnancy. These cells could help heal wounds faster by using special pathways, like the **CCR2/CCL2 pathway**, which guide them to the wound site.