The investigators plan to do a retrospective chart review on patients who underwent laser treatment for their foot ulcer at the UT Southwestern wound clinic.

The investigators plan to do a retrospective chart review on patients who underwent laser treatment for their foot ulcer at the UT Southwestern wound clinic starting on May 17, 2018 to November 13, 2018. The investigators chose this date because that is the first time laser treatments were performed in the clinic. The investigators will collect the following data points:

• Ulcer etiology
• Ulcer location
• Prior ulcer treatment type and duration, and wound measurements/characteristics
• Wound size 4-6 weeks prior to laser treatment; at treatment time; and then each follow up measurement healed or x weeks
• eGFR
• Albumin
• Last A1c-Presence/absence of DM
• Amputation history
• Vascular status via ABI's
• Identify comorbidities
• Identify associated encounters in the patients such as complications (i.e. infection), related readmissions The investigators will identify this information from patient charts (EPIC EMR).

Inclusion Criteria:

• patients who underwent laser treatment for their foot ulcer at the UT Southwestern wound clinic starting on May 17, 2018 to November 13, 2018

Exclusion Criteria:

• not meeting inclusion criteria

Patients of the investigators with foot ulcers.