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Let’s say you just want to highlight cells with duplicate values from the selection, this code can help you in this.

To use this code you just need to select a range of cells and run this code. It checks each cell with the selection and highlights it with red color if a cell has a duplicate value.

Sub DuplicateValuesFromSelection()
Dim myRange As Range
Dim i As Integer
Dim j As Integer
Dim myCell As Range
Set myRange = Selection
For Each myCell In myRange
If WorksheetFunction.CountIf(myRange, myCell.Value) > 1 Then
myCell.Interior.ColorIndex = 3
End If
Next
Next
End Sub